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Cybersecurity Information SecurityTop 10 Best Email Anti-Spam Software of 2026
Top 10 ranking of email anti spam software, comparing Proofpoint Email Protection, Cisco Secure Email, and Sophos Email for filtering accuracy.
How we ranked these tools
Core product claims cross-referenced against official documentation, changelogs, and independent technical reviews.
Analyzed video reviews and hundreds of written evaluations to capture real-world user experiences with each tool.
AI persona simulations modeled how different user types would experience each tool across common use cases and workflows.
Final rankings reviewed and approved by our editorial team with authority to override AI-generated scores based on domain expertise.
Score: Features 40% · Ease 30% · Value 30%
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Proofpoint Email Protection is the best pick for security teams that need governed quarantine control and strong phishing detection across enterprise mail flows, whereas SpamTitan fits teams wanting configurable gateway controls for mixed inbound and outbound domains.
Editor’s top 3 picks
Three quick recommendations before you dive into the full comparison below — each one leads on a different dimension.
Proofpoint Email Protection
Message-level threat disposition with policy actions that enforce consistent quarantine handling across organizational mail flows.
Built for fits when security teams need controlled quarantine governance and strong phishing detection across enterprise mail flows..
Cisco Secure Email
Editor pickCisco Secure Email provides tenant-scale governance controls for policy changes, including audit-ready administrative workflows tied to mail security actions.
Built for fits when enterprise teams need governed email policy enforcement with consistent threat handling..
Sophos Email
Editor pickQuarantine release workflows with operator review controls tied to message-level actions.
Built for fits when mid-size teams want centralized inbound gateway control with automation hooks for exceptions and quarantines..
Related reading
Comparison Table
Proofpoint Email Protection
enterpriseEnterprise email security platform providing anti-spam, anti-phishing, and DLP capabilities.
Message-level threat disposition with policy actions that enforce consistent quarantine handling across organizational mail flows.
Proofpoint Email Protection sits at the secure email gateway layer and performs content and reputation checks before messages reach users. It also provides quarantine handling that security teams can tune by sender, recipient, and detected risk to reduce user exposure. For organizations that need BEC defenses, the detection workflow includes impersonation-focused analysis and policy actions that can route suspicious mail to quarantine or targeted holds.
A tradeoff is that tuning protection levels and quarantine release rules can require sustained governance effort to keep false positives low. It fits best for enterprises that already run centralized identity and routing controls and want consistent behavior across multiple mail flows and tenant environments.
- +Quarantine workflows with policy-based release controls for security teams
- +Enterprise-grade governance with role separation and administrative audit trails
- +Strong phishing and impersonation detection with actionable message disposition
- +Works well with centralized routing requirements across multiple mail systems
- –Protection tuning can take iterative governance to control false positives
- –API and automation require dedicated integration work for custom workflows
- –Quarantine policies can add user friction without clear internal processes
- –Advanced reporting detail can demand analyst time to operationalize
Security operations teams
Quarantine and review BEC impersonation attempts
Reduced user impersonation exposure
Enterprise IT and email engineering
Centralize secure gateway routing
Fewer policy drift incidents
Show 2 more scenarios
Compliance and governance teams
Enforce admin separation and audit trails
Improved control traceability
Use role-based administration and audit logging to track quarantine changes and policy updates.
Incident response teams
Contain suspicious mail during investigations
Faster containment during events
Apply rapid message disposition actions tied to detected indicators to limit spread in the mailbox.
Best for: Fits when security teams need controlled quarantine governance and strong phishing detection across enterprise mail flows.
More related reading
Cisco Secure Email
enterpriseEnterprise email gateway providing anti-spam, anti-malware, and threat intelligence filtering.
Cisco Secure Email provides tenant-scale governance controls for policy changes, including audit-ready administrative workflows tied to mail security actions.
Cisco Secure Email fits organizations that need centralized control over inbound message handling, including policy-driven outcomes like block, quarantine, or allow decisions. Cisco’s messaging security workflow typically includes integration with existing mail infrastructure so rules and threat actions apply without forcing a full mail-system replacement. Detection coverage targets common unwanted email patterns and modern fraud behaviors that try to evade reputation-based controls.
A key tradeoff is that strong governance and policy consistency require disciplined configuration across domains and senders, especially when multiple business units share mail routing. It fits best when teams must coordinate inbound handling and outbound abuse prevention while maintaining auditability for security operations and compliance reporting.
- +Centralized policy control across inbound and outbound message paths
- +Threat handling designed for phishing and identity abuse workflows
- +Enterprise administration patterns with governance and audit support
- +Integration options that align with existing mail infrastructure
- –Configuration requires careful domain scoping to avoid policy drift
- –Quarantine workflows can feel heavy for high-volume teams
- –Deep tuning takes time to stabilize false positive rates
- –Some advanced controls depend on specific deployment integration
Security operations teams
Reduce inbound spam and phishing delivery
Fewer malicious messages reach inboxes
IT operations teams
Standardize rules across multiple domains
Lower configuration drift across mailboxes
Show 2 more scenarios
Email governance owners
Maintain auditability for security actions
Clear records of decision changes
Governance owners use administrative trails tied to policy edits and message actions for compliance review.
GRC and compliance teams
Control quarantine and release workflows
More controlled incident response
Compliance teams define how suspicious messages are contained and how release decisions are handled operationally.
Best for: Fits when enterprise teams need governed email policy enforcement with consistent threat handling.
Sophos Email
enterpriseCloud email security solution providing anti-spam, anti-phishing, and malware protection.
Quarantine release workflows with operator review controls tied to message-level actions.
Sophos Email routes mail through Sophos filtering using DNS MX-record enforcement so the service becomes the choke point for inbound scanning and policy application. Quarantine management supports operator workflows for reviewing, releasing, or blocking messages that match spam and phishing indicators. Security administration is centralized, and the console tracks message actions so teams can audit what happened on a per-message basis.
A tradeoff appears in governance overhead since strong quarantine release policy and exception workflows require consistent admin processes across teams. The strongest fit is a mid-size organization that wants one inbound gateway for spam and phishing control with integration hooks that automation teams can connect to operational processes.
- +MX-record enforcement ensures consistent inbound inspection path
- +Quarantine release workflows reduce manual inbox-level cleanup
- +Admin console ties message actions to operator decisions
- +API integration supports automation for policy and operations
- –Quarantine governance requires disciplined allowlist and exception handling
- –Deep customization can take time to translate into safe policies
- –Operational clarity depends on how teams manage release ownership
- –Advanced workflows may require coordination with directory and tooling
IT security operations teams
Manage quarantined phishing and spam releases
Fewer end-user support tickets
Email security engineers
Automate sender exceptions at scale
Faster response to campaigns
Show 1 more scenario
Compliance and risk teams
Track message handling actions
More defensible incident records
Message-level action history supports internal review of what was quarantined or released.
Best for: Fits when mid-size teams want centralized inbound gateway control with automation hooks for exceptions and quarantines.
Hornetsecurity
enterpriseCloud-based email security and anti-spam platform with advanced threat protection and archiving.
Policy-driven quarantine handling paired with configurable release controls for suspect inbound mail.
Hornetsecurity delivers an email anti-spam stack designed around secure email gateway enforcement and post-delivery protection for inbound traffic. Its gateway controls combine reputation-based filtering with policy actions like quarantine and controlled release for suspect mail.
Admin operations focus on workflow-level governance for mail handling, while integration options support automation and external system coordination. Organizations use Hornetsecurity when they need consistent spam blocking across edge routing and downstream handling.
- +Secure email gateway enforcement reduces reliance on endpoint filtering
- +Quarantine handling supports operational workflows for suspect messages
- +Policy configuration enables consistent spam actions across mail domains
- +Integration and automation options support external operations and monitoring
- –Advanced policy tuning requires governance discipline to limit false positives
- –Some deeper workflow automation depends on integration setup effort
- –High-volume environments can require careful threshold and rules management
- –Multi-system change control adds process overhead during onboarding
Best for: Fits when mail teams need gateway enforcement plus downstream post-delivery control for inbound spam.
SpamTitan
SMBAnti-spam email gateway providing spam filtering, virus scanning, and blocklist management.
Quarantine handling tied to administrator-defined policy thresholds and actions for both message containment and release behavior.
SpamTitan routes inbound and outbound mail through configurable anti-spam and policy controls to reduce unwanted messages before delivery. It combines multiple detection layers, including Bayesian and reputation-based scoring, to catch both bulk spam and lower-volume abuse patterns.
Administrators can tune filtering thresholds and message actions such as quarantine and rejection behavior to control the false positive rate. Governance settings support per-domain and policy-driven handling so different mailflows can be managed with separate rulesets.
- +Layered Bayesian and reputation scoring reduces dependence on a single heuristic
- +Quarantine actions and threshold tuning support practical false positive management
- +Policy rules can be segmented by domain for different mailflow requirements
- +Configuration options cover both inbound filtering and outbound abuse control
- –Deep policy tuning can require iterative adjustment to stabilize spam and ham rates
- –Admin workflow and monitoring are less streamlined than lighter gateway appliances
- –Advanced governance needs extra discipline to keep rule sets consistent
- –External threat intel integration is not always sufficient for rapid zero-day shifts
Best for: Fits when organizations need configurable gateway controls for mixed inbound and outbound mailflows across multiple domains.
Libraesva Email Security
enterpriseEmail security gateway delivering anti-spam, anti-phishing, and malware protection for on-premises and cloud deployments.
Policy based message disposition during SMTP processing with configurable anti spam handling rules.
Libraesva Email Security targets organizations that need tighter control over inbound email filtering and message handling at the gateway. Core capabilities include inbound anti spam and malware protection with policy controls for suspicious traffic and message disposition.
Deployment supports integration into mail routing workflows so security decisions can be applied during SMTP processing and after delivery where configured. Governance features include administrator configuration and reporting so teams can monitor detections and tune policies.
- +Gateway policy controls for inbound spam and risky message disposition
- +Detection tuning designed for reducing false positives in real traffic
- +Automation options for integrating filtering decisions into mail flows
- +Reporting output for tracking detections and operational trends
- –Advanced filtering tuning can require iterative governance discipline
- –Some organizations may need extra integration work for existing mail architecture
- –Visibility into classification detail may be limited for deep incident forensics
- –Outbound related controls are not the primary focus compared with inbound
Best for: Fits when email operations teams need gateway focused spam control with policy tuning and operational reporting.
Bitdefender Security for Mail Servers
SMBEmail security solution providing anti-spam, anti-malware, and content filtering for mail servers.
Post-delivery inspection applies content rules even when messages pass perimeter checks.
Bitdefender Security for Mail Servers focuses on post-delivery email threat handling, which differs from gateways that only filter at SMTP entry. Core capabilities include attachment scanning, malicious URL detection, spam classification, and policy actions like quarantine or rejection.
Administration uses centrally defined mail-scanning policies that can be tailored per domain or recipient groups. Runtime control targets both inbound filtering and message content risks that bypass basic DNS checks.
- +Post-delivery scanning catches threats after initial SMTP checks
- +Policy-driven actions support quarantine and blocking workflows
- +Content inspection covers attachments and message bodies
- +Central management supports consistent enforcement across mail flows
- –Tuning spam thresholds can take time to reduce false positives
- –Requires careful policy layering to avoid rule conflicts
- –Deep reporting depends on log availability and log retention setup
- –Automation coverage is limited compared with SEG products that expose full APIs
Best for: Fits when an organization needs content-level protection after inbound mail is accepted.
ORF Fusion
SMBOn-premises SMTP anti-spam filter for Microsoft Exchange and IIS SMTP with multiple combined filtering technologies.
Policy driven quarantine handling that can be governed through automated detection workflow outcomes rather than manual review.
ORF Fusion from vamsoft.com targets email anti spam with policy enforcement and content scoring focused on post-delivery filtering workflows. Core capabilities center on inbound message analysis that feeds quarantine decisions, plus rules for suspicious sender behavior.
Integration depth is geared toward operational environments that need automated configuration and MTA side hooks. Administrative controls focus on repeatable governance for spam handling outcomes instead of manual mailbox review.
- +Quarantine decisions driven by configurable detection and scoring policies
- +Inbound filtering supports automation patterns used in MTA governed environments
- +Policy outcomes are reproducible across domains and mail flows
- +Operational controls cover governance for handling actions and exceptions
- –Setup requires careful alignment of routing and filtering rules across components
- –Limited visibility features compared with products that provide richer per-reason forensics
- –Less suitable for teams that need pure DNS based controls only
- –Automation depends on integrating the filtering workflow into mail processing
Best for: Fits when an organization needs governed, policy based spam handling with automated detection and quarantine actions.
Apache SpamAssassin
open-sourceOpen-source mail filter that uses a scoring framework and DNS blocklists to classify spam.
Configurable scoring engine with granular rule tuning and plugin extensibility for detection behavior at message-evaluation time.
Apache SpamAssassin filters inbound mail by scoring messages with a ruleset of heuristics and signatures, then tagging or rejecting traffic based on configurable thresholds. It is designed for MTA integration on the receiving path, where custom rules, plugins, and local Bayesian learning can adjust detection behavior over time.
Automation happens through rule management and configuration files that can be deployed across systems, including multi-user setups that separate rule authority from delivery policy. Its extensibility centers on adding or tuning detection components rather than building a separate web workflow for quarantines.
- +Heuristic scoring with tunable thresholds supports predictable policy controls
- +Extensible rule system enables site-specific detection without changing core logic
- +Local Bayesian learning can improve classification for recurring organizational patterns
- +Works with MTA-based receiving workflows instead of requiring post-delivery scanning
- –Rule tuning and false-positive handling require ongoing governance discipline
- –Some deployments rely on external components for DNS checks and reputation lookups
- –Advanced automation requires scripting around configuration and update workflows
- –Inline message handling depends on the chosen MTA integration method
Best for: Fits when email teams need MTA-integrated scoring with custom rules and controlled thresholds for inbound mail.
Rspamd
open-sourceOpen-source spam filtering system using fuzzy hashing, Bayesian classification, and DNS-based checks.
Modular rule and scoring pipeline that enables per-message policy decisions with explainable hits.
Rspamd is an MTA-integrated spam filter that assigns scores with rule-based and probabilistic checks instead of only signature matching. It supports policy features like DNSBL and reputation scoring, message classification, and configurable actions such as reject, add headers, or quarantine-style handling via downstream workflows.
Rspamd is also extensible through modules and can automate governance through configuration management of its rule sets and processing pipelines. For teams that need fine-grained tuning at mail-transfer time, it offers more control than basic DNS-based blocking alone.
- +Scoring engine supports layered rules and probabilistic classification
- +Extensible module system covers DNSBL, phishing-style checks, and policy actions
- +Fine-grained per-recipient and per-domain behavior via rule configuration
- +Exportable telemetry supports ongoing tuning of spam and false-positive rates
- –Configuration complexity rises quickly with multi-domain policies
- –Queue-time tuning needs careful testing to avoid false-negative spikes
- –Operational visibility depends on log discipline and external dashboards
- –Advanced behaviors require familiarity with mail headers and routing paths
Best for: Fits when mail admins need scoring-tuned filtering and automation controls at MTA time.
Conclusion
After evaluating 10 cybersecurity information security, Proofpoint Email Protection stands out as our overall top pick — it scored highest across our combined criteria of features, ease of use, and value, which is why it sits at #1 in the rankings above.
Use the comparison table and detailed reviews above to validate the fit against your own requirements before committing to a tool.
How to Choose the Right email anti spam software
This buyer's guide covers Proofpoint Email Protection, Cisco Secure Email, Sophos Email, Hornetsecurity, and SpamTitan alongside Libraesva Email Security, Bitdefender Security for Mail Servers, ORF Fusion, Apache SpamAssassin, and Rspamd.
The selection criteria focus on message disposition controls, quarantine governance workflows, and integration surfaces for connecting gateway handling with post-delivery and MTA-time policies. Each reviewed tool also gets evaluated for configuration discipline, operational monitoring fit, and the practicality of automation for exception handling and release controls.
Email anti spam software that enforces gateway and post-delivery policy actions
Email anti spam software filters inbound mail and applies policy-driven actions such as quarantine, block, or controlled release based on scoring signals and rule outcomes. Some deployments enforce consistent handling across organizational mail flows, while others split responsibilities between gateway inspection and post-delivery content checks.
Proofpoint Email Protection is built around message-level threat disposition with policy actions that enforce consistent quarantine handling. Bitdefender Security for Mail Servers adds post-delivery inspection so content-level checks still run after messages pass perimeter checks, which changes how tuning and false-positive control are managed.
Message disposition governance, quarantine workflow control, and automation integration
Email anti spam software needs deterministic message disposition so security teams can enforce consistent outcomes across inbound and outbound flows. The strongest options connect detection signals to quarantine release controls and admin audit trails so policy changes do not turn into inconsistent handling.
The guide also weights integration depth because quarantine workflows and exception handling often require automation hooks. Proofpoint Email Protection and Cisco Secure Email both emphasize governed policy actions tied to administrative workflows, while Sophos Email and Hornetsecurity focus on operational quarantine release workflows.
Quarantine release governance with admin controls
Proofpoint Email Protection provides message-level threat disposition with policy actions that enforce consistent quarantine handling across organizational mail flows. Cisco Secure Email adds tenant-scale governance controls for policy changes with audit-ready administrative workflows tied to mail security actions.
Gateway enforcement path consistency for inbound inspection
Sophos Email pairs MX-record enforcement with quarantine release workflows so the inbound inspection path stays consistent. Hornetsecurity also centers secure email gateway enforcement and follows it with configurable release controls for suspect inbound mail.
Policy-driven automation outcomes for quarantine and containment
ORF Fusion provides policy driven quarantine handling that can be governed through automated detection workflow outcomes rather than manual review. SpamTitan ties quarantine actions and threshold tuning to administrator-defined policy actions for both message containment and release behavior.
Post-delivery content inspection for threats that bypass perimeter checks
Bitdefender Security for Mail Servers applies post-delivery inspection so content rules still run after perimeter checks. Hornetsecurity emphasizes gateway enforcement plus downstream post-delivery control for inbound spam handling.
Explainable scoring and rule extensibility for MTA-time filtering
Rspamd uses a modular rule and scoring pipeline for per-message policy decisions with explainable hits. Apache SpamAssassin provides a configurable scoring engine with granular rule tuning and plugin extensibility for message-evaluation time detection behavior.
Choose based on where policy acts and who governs release decisions
The primary choice is where enforcement happens in the message lifecycle, because some products govern SMTP-time disposition while others add post-delivery inspection. The second choice is who controls quarantine release, since some platforms implement operator review workflows while others enforce policy actions through governed administrative workflows.
The third choice is the automation surface available for exception handling, because API and workflow integration work affects how quickly false positives can be managed at scale. Proofpoint Email Protection is built around policy-based quarantine governance, while Apache SpamAssassin and Rspamd focus on MTA-time scoring that depends on ongoing tuning discipline.
Map enforcement to the message lifecycle you need to control
If enforcement must happen during SMTP processing and drive a consistent quarantine outcome, Proofpoint Email Protection and ORF Fusion match that disposition-centric workflow. If content rules must run after a message passes initial perimeter checks, Bitdefender Security for Mail Servers fits post-delivery inspection needs.
Decide whether quarantine release needs operator review or policy action enforcement
If release actions require operator review controls, Sophos Email provides quarantine release workflows tied to message-level actions. If release handling must be governed with audit-ready administrative workflows, Cisco Secure Email and Proofpoint Email Protection align with policy-based governance.
Use gateway enforcement when inbound routing consistency matters
If inbound inspection must stay consistent across domains, Sophos Email uses MX-record enforcement to force that inspection path. If gateway enforcement needs to reduce reliance on endpoint filtering while still supporting operational release controls, Hornetsecurity is structured around secure email gateway enforcement.
Validate automation and integration effort for exception handling
If custom quarantine workflows require integration work, Proofpoint Email Protection includes an API and automation surface that takes dedicated integration effort for custom processes. If the environment expects MTA-time tuning and automation controls via rule configuration, Rspamd and Apache SpamAssassin shift effort toward rule governance rather than external workflow orchestration.
Pick a tuning model that fits the team’s governance discipline
If the organization can manage iterative tuning to stabilize spam and ham rates, SpamTitan supports threshold tuning for quarantine actions and release behavior. If the organization needs an explainable scoring pipeline and accepts configuration complexity, Rspamd supports explainable modular hits but needs careful queue-time testing.
Who needs email anti spam software with governance-aware quarantine workflows
Teams that must enforce consistent quarantine handling across multiple organizational mail flows need governed policy actions with audit trails. Security operations leaders also benefit when quarantine release decisions connect to admin workflows rather than ad hoc inbox cleanup.
Mail administrators who run MTA-time filtering can also benefit from extensible scoring engines, but the operational burden shifts toward ongoing rule tuning discipline and testing to avoid false-negative spikes.
Enterprise security operations that govern quarantine release
Proofpoint Email Protection and Cisco Secure Email align with message disposition governance and audit-ready administrative workflows that enforce consistent quarantine handling.
Organizations that rely on consistent inbound routing for gateway inspection
Sophos Email uses MX-record enforcement with centralized inbound gateway control and quarantine release workflows that reduce inbox-level cleanup.
Mail teams that want MTA-time scoring with extensible rule systems
Apache SpamAssassin and Rspamd support configurable scoring engines and module or plugin extensibility, but they require ongoing governance discipline to control false positives and false negatives.
Environments that need post-delivery protection for messages that pass initial checks
Bitdefender Security for Mail Servers adds content-level protection after perimeter checks, which changes tuning strategy compared with pure gateway-only filtering.
Common pitfalls that cause spam leakage or excessive false positives
The most common failure mode is treating quarantine as a single switch instead of a governance workflow with release controls and tuning responsibilities. Another failure mode is misaligned routing and filtering rules, which can create inconsistent handling across domains.
The following pitfalls connect directly to how Proofpoint Email Protection, Sophos Email, and the scoring-first tools like Apache SpamAssassin and Rspamd behave under policy and tuning changes.
Switching to quarantine without a release workflow that matches security governance
Proofpoint Email Protection and Cisco Secure Email are built to enforce consistent quarantine handling through governed policy actions, so release policy should be planned alongside message disposition. Without that governance discipline, false positives can increase until tuning stabilizes.
Assuming inbound inspection stays consistent without routing enforcement
Sophos Email uses MX-record enforcement to keep inbound inspection on a consistent path, so domain scoping must be aligned with gateway routing. Inconsistent domain scoping can create policy drift and uneven quarantine behavior.
Over-indexing on scoring engines without allocating time for rule governance and testing
Apache SpamAssassin and Rspamd both require ongoing governance discipline to manage false-positive handling and avoid false-negative spikes. A queue-time or ruleset change without careful testing can create immediate spam leakage or user-facing disruption.
Running post-delivery inspection without coordinating action layering
Bitdefender Security for Mail Servers applies post-delivery scanning, so policy layering must be coordinated to avoid rule conflicts with gateway actions. Without alignment, messages can be blocked or quarantined twice with unclear operational outcomes.
How We Selected and Ranked These Tools
We evaluated Proofpoint Email Protection, Cisco Secure Email, Sophos Email, Hornetsecurity, SpamTitan, Libraesva Email Security, Bitdefender Security for Mail Servers, ORF Fusion, Apache SpamAssassin, and Rspamd on message disposition control, quarantine governance workflow fit, and integration surfaces for connecting gateway handling with post-delivery and MTA-time policies. Features accounted for 40% of scoring, while ease of configuration and operational value each accounted for 30%.
Proofpoint Email Protection placed first due to message-level threat disposition that enforces consistent quarantine handling through policy actions, plus quarantine governance workflows with policy-based release controls and administrative audit trails. The ranking also favored tools where automation and integration work can connect exception handling to governed release actions rather than requiring manual inbox processing.
Frequently Asked Questions About email anti spam software
How does Proofpoint Email Protection handle quarantine governance across multiple domains?
Which tools offer API-based integration points for automated allowlists, blocklists, or workflow exceptions?
What breaks if an organization needs post-delivery content protection instead of SMTP-time filtering?
When does Cisco Secure Email fit better than a tool focused on post-delivery scanning?
Which products support MTA integration with rule extensibility for scoring and threshold tuning?
How does Sophos Email reduce false positives when quarantining suspected spam and phishing?
How do Hornetsecurity and Proofpoint Email Protection differ in their quarantine release workflow controls?
What administrative governance features matter when multiple teams must manage exceptions and mail handling outcomes?
When is Libraesva Email Security a better fit than an MTA-focused scoring stack like Rspamd?
Tools reviewed
Primary sources checked during evaluation.
Referenced in the comparison table and product reviews above.
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