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Blocking Spammers that use SMTP Auth

Nathan Salt -

PROBLEM
I need to block spammers using forged From: headers.

ENVIRONMENT

  • On-Premise Server + WebMail Installations: Version 6.0 > Current Version

CAUSE
Some spammers may wish to use your server as a relay, using SMTP Authentication with forged From: headers.

RESOLUTION

You can block them by doing the following steps:

  1. Open the configure file in your editor
    /usr/local/atmail/mailserver/configure
  2. Find this line:
    accept authenticated = *
  3. ABOVE that line, add the following:
    deny condition = ${if match{$sender_address}{$authenticated_id}{0}{1}}
    log_message = Email blocked - Possible Spam
  4. Save the changes to the configure file, and restart Exim
    killall -HUP exim
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