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CleanMail Email Security - Anti-Spam & Anti-Virus

CleanMail is the first anti-spam & anti-virus filter, that was designed from the beginning to provide complete email security - protecting you from spam and all kinds of email-borne malware like viruses and phishing mails - while at the same time making installation and usage as easy as possible. No more spam and viruses - just clean mail!


CleanMail Server

Complete Email Security (Anti-Spam, Anti-Virus, Anti-Phishing) Filter for Windows & Linux Mail Servers

Free Trial Download Browse Licenses

CleanMail Home

Complete Email Security (Anti-Spam, Anti-Virus, Anti-Phishing) Filter for POP3 Email Clients on Windows

Free Trial Download Browse Licenses

CleanMail Hosted Anti-Spam

Let us take care of your email problems. Complete Email Security, no software to install or maintain - just clean mail!

If you are interested in a free trial, just send us an email and we'll create an account for you.

Free Trial

CleanMail Features

Complete Email Security with CleanMail

Award-winning SpamAssassin engine

It comes with the full range of different antispam filters, including the award-winning SpamAssassin™ engine and a built-in spam trap


CleanMail integrates the Clam Anti-Virus package and additionally supports all popular virus checkers to protect you against all kinds of email-borne virus attacks.

Attachment Filter

CleanMail's built-in attachment filter effectively blocks all kinds of potentially malicious email attachments.

DNS Blacklist (DNSBL) Filter:

The DNSBL filter rejects all mail that has been relayed by a blacklisted host.

SMTP Traffic Limiting

CleanMail Server implements very effective algorithms to protect your Mail Server against Directory Harvesting, SMTP AUTH attacks and Mail Flooding.

POP3-to-SMTP Connector

Automatically retrieve messages from a POP3 server and forward these messages (after filtering) to a mail account on your SMTP server.

Global Spam Fingerprint Filter

Our Fingerprint filter calculates message fingerprints (fuzzy hashes) and compares them against a database of known spam message fingerprints.

Delay Filter

The Delay Filter itself already blocks up to 73% of all junk mails while causing only minimal resource usage on the host system.

Revision History

  • v5.9.3.1
    Features & Improvements
    Mar 28, 2023
    • OpenSSL updated

      SpamAssassin rules updated

      Minor fixes and improvements

  • v5.9.2.1
    Features & Improvements
    Aug 11, 2022
    • TLS: changed the way certificate chains are loaded

      SpamAssassin rules updated

      Minor fixes and improvements

  • v5.9.1.5
    Features & Improvements
    Apr 14, 2021
    • Windows only update

      Windows install: check if Windows Vista/2008 or later

  • v5.9.1.4
    Features & Improvements
    Apr 7, 2021
    • OpenSSL updated

      User Manual updated

      Log file UTF-8 encoded

      Windows XP/2003 no longer supported

      SpamAssassin rules updated

      Minor fixes and improvements

  • v5.8.3.3
    Features & Improvements
    Sep 8, 2020
    • Default skip size limit increased to 3MB

      SpamAssassin rules updated

      Minor fixes and improvements

Frequently Asked Questions

What is Spam Assassin™?

Award-winning SpamAssassin™ (http://spamassassin.apache.org) is considered the industry's leading spam filter, always finishing as one of the top contenders, or even best, in all spam filter tests. CleanMail always includes the latest stable version of SpamAssassin™. Future updates of SpamAssassin™ will be merged into the distribution, once they are proven and stable. Note: We do not sell SpamAssassin™, as it is free open source software! SpamAssassin is a trademark of Deersoft, Inc. The SpamAssassin open source project resides at http://spamassassin.apache.org.

What is ClamAV?

Clam AntiVirus (ClamAV) is a free software, cross-platform and open-source antivirus software toolkit able to detect many types of malicious software, including viruses. One of its main uses is on mail servers as a server-side email virus scanner.

Why do I seem to get email addressed to other people?

This can happen for two reasons:

•You received a "blind carbon copy": the sender listed your address in the BCC address field, and thus omitted from the message.
•The mail transfer protocol uses RCPT TO and MAIL FROM commands when transmitting a mail. The addresses used there need not have anything to do with the To and CC header fields in the message itself. But these header fields are displayed by your mail client. So it can appear as if the mail was not addressed to you at all.

More FAQs ...