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Best Anti-spam Software in 2026

  1. 1

    Apache SpamAssassin

    Free plan Open source APILinuxMac+2

    SpamAssassin offers configurable server-side spam classification with multiple detection methods and integration options.

    9.3 Open source Visit site
  2. 2

    Avidemux

    Free plan Open source LinuxMacWeb+1
    9.3 Free plan Visit site
  3. 3

    Rspamd

    Free plan Open source APILinuxMac+2

    Rspamd offers a self-hosted email filtering engine with multiple authentication checks, malware integrations, and custom rule options.

    8.9 Free plan · paid from £100/mo Visit site
  4. 4

    Mailprotector

    Free plan APIWeb

    Mailprotector brings filtering, encryption, and archiving products together for MSPs. Check Shield's Microsoft 365 limitation and request product pricing before choosing.

    7.2 Pricing on request Visit site
  5. 5

    SPAMfighter

    Free plan AndroidExtensioniPhone+3

    SPAMfighter lists multiple protections and support for several mail programs, with a separate Mail Gateway option for SMTP and mail-server platforms.

    7.1 Free plan · 10-day trial Visit site
  6. 6

    MX Guarddog

    Free plan Web

    MX Guarddog offers hosted filtering and outage mail holding for standard SMTP servers on owned domains. Check the per-address monthly charge and seven-day quarantine retention when considering it.

    6.9 Free plan · paid from $0.25/mo · 30-day trial Visit site
  7. 7

    Xeams

    Free plan APILinuxMac+3

    Xeams combines mail-server functions with layered spam filtering, quarantine, and administration tools.

    6.9 Free plan · paid from $1.67/user/mo (annual) · 30-day trial Visit site
  8. 8

    GFI MailEssentials

    Free trial Self-hostedWindows

    MailEssentials provides layered filtering, malware scanning, and configurable email rules for Windows server deployments.

    6.2 30-day trial Visit site
  9. 9

    MIMEDefang

    Free plan Linux
    5.9 Free plan Visit site
  10. 10

    MailChannels Inbound Filtering

    Paid APIWeb

    Inbound Filtering combines mail threat detection with quarantine, search, and per-domain controls for hosting providers.

    5.7 Pricing on request Visit site
  11. 11

    spamd

    Free plan
    5.6 Free plan Visit site
  12. 12

    SpamTitan Gateway

    Free trial Self-hostedWeb

    SpamTitan Gateway combines mail-flow administration with spam analysis, antivirus engines, and outbound controls.

    5.6 From $1.95/user/mo (annual) Visit site
  13. 13

    SpamSieve

    Free trial Mac

    SpamSieve is focused on filtering mail inside supported Mac applications, with local processing and customizable rules.

    5.5 From $39.99 · 30-day trial Visit site
  14. 14

    MailRoute

    Paid AndroidiPhoneWeb
    4.7 From $2/user/mo · 30-day trial Visit site
  15. 15

    SpamBrella

    Paid Web
    4.3 Pricing on request · 30-day trial Visit site
  16. 16

    PreciseMail Anti-Spam Gateway

    Paid
    4.0 Pricing on request Visit site
  17. 17

    Vircom modusCloud

    Paid Web
    3.8 Pricing on request Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

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