15.8
Free plan
Best Email Spam Filtering Software in 2026
Email spam filtering software screens unwanted email before it reaches an inbox. This list covers services delivered through web interfaces, APIs or self-hosted deployments. If you use a Xiaomi, Redmi or POCO phone, check whether a service provides an Android app or a mobile-friendly web experience. Confirm the platform details and connection method that fit your setup.
25.8
SpamTitan Gateway is an anti-spam appliance for administrators who need to control mail flow and protect networks from unwanted email and malware.
WebSelf-hosted
35.6
Darktrace / EMAIL uses behavioral AI to identify and stop email threats such as phishing, business email compromise, impersonation, and social engineering.
WebAPI
- 45.4
- 55.1
- 64.9
- 74.7
- 8
Trend Vision One
Trend Micro
4.5 - 9
Check Point Harmony Email & Collaboration
Check Point
4.3 - 10
Sophos Email
Sophos
4.3 - 11
Trellix Email Security
Trellix
4.3
Choosing well
Check Android access
The platform options described here are web, API and self-hosted.
A web service may suit a browser workflow, while an API can connect filtering to another mail system.
Match the deployment model
Compare web access, API integration and self-hosted operation. Self-hosting can matter when you need to run the filter within your own environment; an API may suit an existing mail pipeline.
Read the price details
Paid pricing details are shown for Abnormal Security, Cloudflare, Darktrace / EMAIL, Hornetsecurity 365 Total Protection, Mimecast Email Security and SpamTitan Gateway; other listings may require a quote.
For Cloudflare, the notes show a Free Plan and a Pay-as-you-go option priced at $7 per month. SpamTitan Gateway shows pricing starting at $1.95 per user per month with an annual term.
Use trial terms carefully
Where trial periods are given, Darktrace / EMAIL and Mimecast Email Security each show 30 days, while Hornetsecurity 365 Total Protection shows 14 days.
Check whether the trial covers the deployment type and mail flow you plan to use, and note when paid pricing begins.
Look for a free plan
A labeled free plan can help you start without a subscription. Cloudflare is shown with a Free Plan; other entries may say no free plan is offered or leave plan details unstated, so confirm the current terms.
Questions people ask
Do these tools have Android apps?
The platform information provided covers web, API and self-hosted use, without specifying Android apps. Check each product's current platform details before choosing.
Can I run an email filter through an API?
API is one of the platform types represented in this category. Confirm the service's integration details and whether they fit your mail system.
Are free trials available?
Some entries provide trials. The stated periods are 30 days for Darktrace / EMAIL and Mimecast Email Security, and 14 days for Hornetsecurity 365 Total Protection.
Which service lists a free plan?
A Free Plan is listed for Cloudflare. Check the current plan terms before relying on it for your email setup.
What is the lowest stated paid price?
SpamTitan Gateway shows a starting price of $1.95 per user per month on an annual term. Cloudflare shows a Pay-as-you-go plan costing $7 per month.