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Best Email Spam Filtering Software in 2026

Email spam filtering software is for screening unwanted messages. This list is for people choosing a tool on a budget and comparing what it costs and how it can be deployed.

  1. 1

    SpamTitan Gateway

    Free trial Self-hostedWeb

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

    5.7 From $1.95/user/mo (annual) Visit site
  2. 2

    Darktrace / EMAIL

    Paid APIWeb

    Darktrace / EMAIL combines behavioral threat detection with response options and coverage beyond inbound email. Pricing requires a request, while a 30-day trial is listed.

    5.6 Pricing on request · 30-day trial Visit site
  3. 3

    Abnormal Security

    Paid Web
    4.7 Pricing on request Visit site
  4. 4

    Hornetsecurity 365 Total Protection

    Paid Web
    4.6 Pricing on request · 14-day trial Visit site
  5. 5

    Microsoft Defender for Office 365

    by Microsoft
    Paid Web
    4.6 Visit site
  6. 6

    Cloudflare

    Paid
    4.5 Visit site
  7. 7

    Check Point Harmony Email & Collaboration

    by Check Point
    Paid
    4.3 Visit site
  8. 8

    Mimecast Email Security

    Paid Web
    4.3 Pricing on request · 30-day trial Visit site
  9. 9

    Sophos Email

    by Sophos
    Paid
    3.8 Visit site
  10. 10

    Trellix Email Security

    by Trellix
    Paid
    3.7 Visit site
  11. 11

    Trend Vision One

    by Trend Micro
    Paid
    3.7 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

Check whether a free plan exists, whether a free trial has a stated length, and whether pricing is public or on request. If you need to read or change code, check the licence. Confirm that web, API, or self-hosted deployment fits your setup.

Questions

What deployment options can I compare?

Check for web, API, or self-hosted deployment. The right option depends on how your email system is operated.

Does any tool list a free plan?

A Free Plan is listed for Cloudflare. Check the listing for the tool you are considering before setting a budget.

Which tools list free trials?

Darktrace / EMAIL and Mimecast Email Security advertise trials lasting 30 days. Hornetsecurity 365 Total Protection shows a 14-day trial.

Which tools show pricing on request?

Pricing is listed as available on request for Abnormal Security, Darktrace / EMAIL, Hornetsecurity 365 Total Protection, and Mimecast Email Security.

What is the listed SpamTitan Gateway price?

The listed starting rate for SpamTitan Gateway is $1.95 per user each month on annual billing.

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