Best email spam filters
Spam and email-threat filters that sit in front of or inside a mail server and score, quarantine or reject unwanted mail.
8 apps, ordered by visits from AppBreakup and how often our research lists each one as an alternative. Open any app to see its alternatives.
All email spam filters
- Alternatives to SpamTitan
Commercial email security and spam filtering service for businesses and MSPs.
PaidWeb, Self-hosted - Alternatives to Proxmox Mail Gateway
Open-source email security gateway that filters spam and viruses before they reach your mail server.
Open sourceSelf-hosted, Linux - Alternatives to Proofpoint
Enterprise email security that blocks phishing, malware and impersonation before and after delivery.
PaidWeb - Alternatives to Mimecast
Cloud email security gateway with archiving, continuity and human risk tools for businesses.
PaidWeb - Alternatives to Rspamd
Fast open-source spam and email security filter for mail servers.
Open sourceSelf-hosted, Linux - Alternatives to Apache SpamAssassin
Open-source spam filter that scores email for mail servers.
Open sourceSelf-hosted, Linux - Alternatives to Microsoft Defender for Office 365
Microsoft's email and collaboration security add-on for Microsoft 365.
PaidWeb - Alternatives to Barracuda Email Protection
AI-assisted email security, backup and archiving for Microsoft 365 and Google Workspace.
PaidWeb
Our picks by need
Common questions
What are the best email spam filters?
Based on how often our research lists them as alternatives and visits from AppBreakup, the leading email spam filters right now are SpamTitan, Proxmox Mail Gateway, Proofpoint, Mimecast and Rspamd.
Are there free email spam filters?
Yes. Proxmox Mail Gateway (open source), Rspamd (open source) and Apache SpamAssassin (open source) have a free option, out of 3 free or freemium apps we track.
Which email spam filters are open source?
None of the apps in this category is open source.