What is SpamAssassin and what does it do? How to Install SpamAssassin to Directadmin ...

The SpamAssassin system is an automatic e-mail filtering system that tries to identify incoming spam messages and warn users according to the content and body of the e-mail headers. Thanks to the SpamAssassin system, you can automatically delete messages marked as spam and add an email address or domain as a blacklist/whitelist. SpamAssassin examines the spam characteristics for each email message.

To Install SpamAssassin via SSH to Directadmin;

To install yum modules use the command below,

yum -y install perl-ExtUtils-MakeMaker perl-Digest-SHA perl-Net-DNS perl-NetAddr-IP perl-Archive-Tar perl-IO-Zlib perl-Digest-SHA perl-Mail-SPF perl-IP-Country perl -Razor2 perl-Net-Ident perl-IO-Socket-INET6 perl-IO-Socket-SSL perl-Mail-DKIM perl-DBI perl-Encode-Detect perl-HTML-Parser perl-HTML-Tagset perl-Time-HiRes perl -libwww-perl perl-Sys-Syslog

Then complete the installation by executing the following commands in order.

cd /usr/local/directadmin/custombuild
./build set spamassassin yes
./build spamassassin

What to do after installation

Once SpamAssassin is installed, the E-mail Management → SpamAssassin Setup section becomes active in DirectAdmin. There you can enable the filter for each domain and set the spam threshold. The default threshold is usually 5 points; a lower value means stricter filtering.

• Move to spam folder: keeps suspicious e-mails in a separate folder instead of deleting them.
• Blacklist: always blocks e-mails from specific addresses or domains.
• Whitelist: prevents important senders from being marked as spam.

How do I know the filter is working?

If you see X-Spam-Status and X-Spam-Score lines in the headers of an incoming e-mail, SpamAssassin is active. Adjust the threshold gradually if legitimate messages are being flagged.