18.2
Rspamd is an open-source email security engine designed to filter phishing, business email compromise, malicious attachments, and spam.
Free planOpen sourceWebAPILinux
Best Anti-Spam Software in 2026
Anti-spam software filters unwanted or harmful email before it reaches an inbox. This category includes hosted services, self-hosted tools and software with web, API, Windows, Linux or macOS access. Compare free plans, paid starting prices and trials, then check phishing protection, malware scanning and quarantine controls. If you use a phone, confirm whether the product has an Android app and what the app can do;…
28.0
SPAMfighter is Windows software for filtering unwanted email in supported mail programs.
Free planAndroidiOSExtension
37.8
Xeams is an email server and spam firewall that can run on its own, sit in front of another mail server, or work in hybrid mode.
Free planWebAPILinux
- 4
Apache SpamAssassin
Apache SpamAssassin is free, open-source software that classifies email and helps system administrators block unsolicited bulk messages.
Free planOpen sourceAPILinuxmacOSSelf-hosted7.4Free plan - 5
Avidemux
Free planOpen sourceWebLinuxmacOSWindows7.3Free plan - 6
Mailprotector
Mailprotector builds and supports products for securing and managing organizational email, and says its products are made exclusively for managed service providers (MSPs).
Free planWebAPI7.0Free plan - 7
MailChannels Inbound Filtering
MailChannels Inbound Filtering is a cloud gateway for hosting providers that run email at scale.
WebAPI6.1 - 8
MX Guarddog
MX Guarddog is a cloud email gateway for standard SMTP servers used with owned domains.
Web6.1$0.25 usage-based - 9
SpamSieve
SpamSieve is a macOS application that adds spam filtering to compatible Mac mail programs.
macOS6.1$39.99 one-time - 10
SpamTitan Gateway
SpamTitan Gateway is an anti-spam appliance for administrators who need to control mail flow and protect networks from unwanted email and malware.
WebSelf-hosted5.8 - 11
GFI MailEssentials
GFI MailEssentials is an anti-spam and email security solution for on-premise mail servers.
Self-hostedWindows5.6 - 12
MailRoute
AndroidiOSWeb5.2 - 13
SpamBrella
Web4.7 - 144.6
- 15
MIMEDefang
Linux4.4 - 164.3
- 174.3
Choosing well
Compare free plans and trials
A free plan is available from tools such as Apache SpamAssassin, MIMEDefang, Rspamd and spamd. Other products use paid plans, pricing on request or a trial period.
Check whether a free plan fits your deployment and user needs. A trial can help you review the paid service before committing, while a readable starting price makes direct comparison easier.
Check the filtering controls
Compare phishing protection, malware scanning and quarantine controls in the listing. PreciseMail Anti-Spam Gateway is marked with phishing protection.
Look for the controls your mail flow requires, and confirm how quarantined messages are handled before choosing a service.
Match the deployment to your setup
The category includes web, Windows, Linux, macOS, API and self-hosted options. MailChannels Inbound Filtering lists web and API access.
A self-hosted tool may suit an administrator who manages infrastructure, while a web service can fit teams that want browser-based administration. Confirm the supported platform before setup.
Review users, API and continuity
Compare users included, API access and email continuity. These fields help show how a product fits a team, an automated mail workflow or a continuity plan.
Check the product details for limits and access methods that match your organisation before selecting a plan.
Questions people ask
Can I use anti-spam software for free?
A free plan is offered by products in this category, including Apache SpamAssassin, MIMEDefang, Rspamd and spamd. Check the product's plan details for fit and limits.
Which protection features should I compare?
Compare phishing protection, malware scanning and quarantine controls. The listing marks PreciseMail Anti-Spam Gateway with phishing protection.
What deployment choices are available?
Listed deployment platforms include web, macOS, self-hosted, API, Linux and Windows. Confirm the product's platform details before choosing.
Do any products offer a trial?
Trial periods are offered by products in the category. Examples include GFI MailEssentials, MailRoute, MX Guarddog and SpamBrella; check the product terms for duration.