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Completely disable Amavisd + ClamAV + SpamAssassin

In iRedMail, Amavisd provides below features:

• content-based spam scanning (invoke SpamAssassin)
• Virus scanning (invoke ClamAV)
• DKIM signing
• DKIM verification (through SpamAssassin + Perl module)
• SPF verification (through SpamAssassin + Perl module)
• Disclaimer (throught AlterMIME)

Stop virus/spam scanning, keep DKIM signing/verification and Disclaimer

If you want to disable virus and spam scanning, but keep DKIM signing and disclaimer, please try this:

• Keep content_filter = smtp-amavis:[127.0.0.1]:10024 in Postfix config file /etc/postfix/main.cf.

• Find below lines in Amavisd config file:

  • On RHEL/CentOS, it's /etc/amavisd/amavisd.conf
  • On Debian/Ubuntu, it's /etc/amavis/conf.d/50-user
  • On FreeBSD, it's /usr/local/etc/amavisd.conf
  • On OpenBSD, it's /etc/amavisd.conf

# @bypass_virus_checks_maps = (1);  # controls running of anti-virus code
# @bypass_spam_checks_maps  = (1);  # controls running of anti-spam code

Uncomment above lines (removing "# " at the beginning of each line), and restart Amavisd service.

Completely disable all features

If you want to completely disable spam and virus scanning services, steps:

• Comment out below two lines in Postfix config file /etc/postfix/main.cf:

content_filter = smtp-amavis:[127.0.0.1]:10024
receive_override_options = no_address_mappings  # <- it's ok if you don't have this line

• Comment out below line in Postfix config file /etc/postfix/master.cf,

  -o content_filter=smtp-amavis:[127.0.0.1]:10026

• Restarting Postfix service is required.
• Disable network services: Amavisd, ClamAV.

Notes:

• ClamAV and SpamAssassin will be invoked by Amavisd, so if you disable Amavisd, those two are disabled too.
• SpamAssassin doesn't have daemon service running in iRedMail solution, so there's no need to stop SpamAssassin service.