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SpamTitan alternatives: 6 apps ranked by verified data

Facts checked Nov 8, 2026AppBreakup editorialHow we rankAll email spam filters

Top picks

Common reasons people leave SpamTitan: no public prices; quotes only, and closed source, unlike SpamAssassin or Rspamd. We ranked 6 alternatives by how directly each one replaces SpamTitan, then by reviews, real visits and how recently each app's facts were checked against its own website. Rspamd currently ranks first.

Quick comparison

#AppPricingVerified priceOpen sourcePlatformsVerified factsScore
1Rspamd logoRspamdOpen sourceFrom £100 + VAT/monthNoSelf-hosted, Linux4 of 468.8
2Proxmox Mail Gateway logoProxmox Mail GatewayOpen source€540/year per hostNoSelf-hosted, Linux4 of 464.8
3Apache SpamAssassin logoApache SpamAssassinOpen source—NoSelf-hosted, Linux5 of 561.8
4Proofpoint logoProofpointPaid—NoWeb4 of 442.3
5Mimecast logoMimecastPaid—NoWeb4 of 442.3
6Microsoft Defender for Office 365 logoMicrosoft Defender for Office 365Paid$2 per user/month (Plan 1, yearly)NoWeb4 of 442.3
  1. Rspamd logo

    1. RspamdTop pick

    Best for: Admins of busy mail servers who want a faster, modern replacement for SpamAssassin

    Open sourceSelf-hosted, Linux

    68.8

    score / 100

    Why switch from SpamTitan

    Free open-source engine you host yourself, with optional paid support from its developers.

    Pros

    • Fast C core that handles high mail volumes
    • Built-in SPF, DKIM, DMARC and ARC checks
    • Loads SpamAssassin rules for gradual migration
    • Free engine, with optional paid support and data feeds

    Cons

    • Many modules and settings to learn
    • Some extra detection data requires a paid plan
    • Needs a mail server and admin skills to run
    Visit Rspamd Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Rspamd a good SpamTitan alternative?

    Verified facts

    4 of 4 verified
    License
    Apache 2.0
    Checked Nov 8, 2026rspamd.com(opens source in a new tab)
    Premium plans
    From £100 + VAT/month
    Checked Nov 8, 2026rspamd.com(opens source in a new tab)
    SpamAssassin rules
    Supported
    Checked Nov 8, 2026rspamd.com(opens source in a new tab)
    Sender authentication
    SPF, DKIM, DMARC, ARC
    Checked Nov 8, 2026rspamd.com(opens source in a new tab)
  2. Proxmox Mail Gateway logo

    2. Proxmox Mail Gateway

    Best for: Companies running their own mail servers who want a packaged filtering gateway with a web UI

    Open sourceSelf-hosted, Linux

    64.8

    score / 100

    Why switch from SpamTitan

    Open-source gateway with public per-host pricing and unlimited users.

    Pros

    • Complete gateway with web UI, quarantine and mail tracking
    • Bundles ClamAV antivirus and SpamAssassin
    • Open source and usable without a subscription
    • Subscriptions cover unlimited users and domains per host

    Cons

    • You run and maintain the gateway yourself
    • Support and the enterprise repository need a paid subscription
    • Relies on SpamAssassin, so it inherits its performance limits
    Visit Proxmox Mail Gateway Details and reviews
    How this score is calculated
    Editorial fit ×0.387
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Proxmox Mail Gateway a good SpamTitan alternative?

    Verified facts

    4 of 4 verified
    License
    GNU AGPLv3
    Checked Nov 8, 2026proxmox.com(opens source in a new tab)
    Starting price
    €540/year per host
    Checked Nov 8, 2026proxmox.com(opens source in a new tab)
    Users and domains
    Unlimited per subscription
    Checked Nov 8, 2026proxmox.com(opens source in a new tab)
    Filtering engines
    Postfix, ClamAV, SpamAssassin
    Checked Nov 8, 2026proxmox.com(opens source in a new tab)
  3. Apache SpamAssassin logo

    3. Apache SpamAssassin

    Best for: Mail server admins who want a free, well-documented and widely supported spam filter

    Open sourceSelf-hosted, Linux

    61.8

    score / 100

    Why switch from SpamTitan

    Free filter with no licence costs, if you have the skills to run your own mail server.

    Pros

    • Free and open source with no paid tier
    • Works with most mail transfer agents and control panels
    • Rules and scores are plain text and easy to extend
    • Long track record and plenty of documentation

    Cons

    • Perl-based and slower than newer engines on busy servers
    • Needs a mail server and admin skills to set up
    • Community support only, with no official paid support
    Visit Apache SpamAssassin Details and reviews
    How this score is calculated
    Editorial fit ×0.377
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Apache SpamAssassin a good SpamTitan alternative?

    Verified facts

    5 of 5 verified
    License
    Apache-2.0
    Checked Oct 29, 2026github.com(opens source in a new tab)
    Owner
    Apache Software Foundation
    Checked Nov 8, 2026spamassassin.apache.org(opens source in a new tab)
    Detection methods
    Rules, Bayesian filtering, DNS blocklists
    Checked Nov 8, 2026spamassassin.apache.org(opens source in a new tab)
    Latest release
    4.0.2 (30 Aug 2025)
    Checked Nov 8, 2026spamassassin.apache.org(opens source in a new tab)
    Integrations
    Postfix, Sendmail, qmail and more
    Checked Nov 8, 2026spamassassin.apache.org(opens source in a new tab)
  4. Proofpoint logo

    4. Proofpoint

    Best for: Large organisations that want gateway or API email protection plus DLP and training from one vendor

    PaidWeb

    42.3

    score / 100

    Why switch from SpamTitan

    Enterprise step up with API deployment for Microsoft 365, sandboxing and DLP.

    Pros

    • Choice of inline gateway or API deployment for Microsoft 365
    • Attachment and URL sandboxing with post-delivery removal
    • Broad suite: DMARC, DLP, awareness training and archiving

    Cons

    • Quote-only pricing with no self-serve plan
    • Built for enterprises; heavy for very small businesses
    • Many features are split across separately sold modules
    Visit Proofpoint Details and reviews
    How this score is calculated
    Editorial fit ×0.312
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Proofpoint a good SpamTitan alternative?

    Verified facts

    4 of 4 verified
    Deployment
    API or secure email gateway
    Checked Nov 8, 2026proofpoint.com(opens source in a new tab)
    Microsoft 365
    API integration
    Checked Nov 8, 2026proofpoint.com(opens source in a new tab)
    Sandboxing
    Attachments and URLs
    Checked Nov 8, 2026proofpoint.com(opens source in a new tab)
    Supported platforms
    Microsoft 365, Google Workspace
    Checked Nov 8, 2026proofpoint.com(opens source in a new tab)
  5. Mimecast logo

    5. Mimecast

    Best for: Companies wanting a hosted email gateway with continuity and archiving in the same contract

    PaidWeb

    42.3

    score / 100

    Why switch from SpamTitan

    Enterprise gateway that adds mail continuity and archiving.

    Pros

    • MX gateway or API deployment, for cloud, on-prem or hybrid mail
    • Mail continuity if your own server goes down
    • Archiving, DMARC and training available on the same platform

    Cons

    • No public pricing; quote through sales or partners
    • Feature set and console can be a lot for small teams
    • Advanced modules cost extra on top of core filtering
    Visit Mimecast Details and reviews
    How this score is calculated
    Editorial fit ×0.312
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Mimecast a good SpamTitan alternative?

    Verified facts

    4 of 4 verified
    Deployment
    MX-based or API-based
    Checked Nov 8, 2026mimecast.com(opens source in a new tab)
    Supported mail
    Microsoft 365, Google, on-prem, hybrid
    Checked Nov 8, 2026mimecast.com(opens source in a new tab)
    Email continuity
    Yes
    Checked Nov 8, 2026mimecast.com(opens source in a new tab)
    Customers
    42,000
    Checked Nov 8, 2026mimecast.com(opens source in a new tab)
  6. Microsoft Defender for Office 365 logo

    6. Microsoft Defender for Office 365

    Best for: Organisations on Microsoft 365 that want stronger email security without another vendor.

    PaidWeb

    42.3

    score / 100

    Why switch from SpamTitan

    Microsoft's own filtering add-on, often already licensed by Microsoft 365 businesses.

    Pros

    • Already included in Business Premium and E5 licences
    • Covers Teams, SharePoint and OneDrive, not just email
    • Plan 2 links into Defender XDR for incident response
    • No MX record changes since it's built into Exchange Online

    Cons

    • Only protects Microsoft 365 mailboxes
    • Investigation and simulation tools need Plan 2
    • Annual per-user billing for the add-on
    Visit Microsoft Defender for Office 365 Details and reviews
    How this score is calculated
    Editorial fit ×0.312
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Microsoft Defender for Office 365 a good SpamTitan alternative?

    Verified facts

    4 of 4 verified
    Starting price
    $2 per user/month (Plan 1, yearly)
    Checked Nov 8, 2026microsoft.com(opens source in a new tab)
    Plan 2 price
    $5 per user/month (yearly)
    Checked Nov 8, 2026microsoft.com(opens source in a new tab)
    Free trial
    90 days (Plan 2)
    Checked Nov 8, 2026learn.microsoft.com(opens source in a new tab)
    Included in
    Microsoft 365 Business Premium, E3 (Plan 1), E5 (Plan 2)
    Checked Nov 8, 2026learn.microsoft.com(opens source in a new tab)

The best SpamTitan alternative for…

The highest-ranked app in this list for each need.

Rspamd logo

Best SpamTitan alternative for most people

Rspamd

Free open-source engine you host yourself, with optional paid support from its developers.

Proxmox Mail Gateway logo

Best SpamTitan alternative for a free option

Proxmox Mail Gateway

Open-source gateway with public per-host pricing and unlimited users.

Apache SpamAssassin logo

Best SpamTitan alternative for Linux

Apache SpamAssassin

Free filter with no licence costs, if you have the skills to run your own mail server.

Proofpoint logo

Best SpamTitan alternative for working in the browser

Proofpoint

Enterprise step up with API deployment for Microsoft 365, sandboxing and DLP.

SpamTitan alternatives: common questions

What is the best alternative to SpamTitan?

Rspamd ranks first right now. Free open-source engine you host yourself, with optional paid support from its developers. Proxmox Mail Gateway and Apache SpamAssassin follow it in our ranking.

SpamTitan vs Rspamd: what's the difference?

SpamTitan is a paid product; Rspamd is free and open source. Only SpamTitan runs on Web. Only Rspamd runs on Linux.

Is SpamTitan free?

SpamTitan is a paid product. Pricing: By quote. Checked on SpamTitan's own site, November 2026.

How much do SpamTitan alternatives cost?

Verified prices for the top-ranked SpamTitan alternatives: Rspamd, From £100 + VAT/month; Proxmox Mail Gateway, €540/year per host; Microsoft Defender for Office 365, $2 per user/month (Plan 1, yearly). Each price was checked on the app's own site; see each card below for the date and source.

Is there a free alternative to SpamTitan?

Yes. Rspamd (open source), Proxmox Mail Gateway (open source) and Apache SpamAssassin (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to SpamTitan?

None of the 6 alternatives in this list is open source.

Which SpamTitan alternatives work on Linux?

Rspamd, Proxmox Mail Gateway and Apache SpamAssassin run on Linux.

Why do people switch from SpamTitan?

The complaints we hear most: no public prices; quotes only; closed source, unlike SpamAssassin or Rspamd; aimed at businesses and MSPs rather than individuals.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces SpamTitan, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.