Detect if your mailserver is used as a spambot

To detect if your mail server is being used as a spambot, read this article.

Postfix

If you are using the postfix mta, you can detect if your server is used as a spambot:

• send yourself a mail
• see which log file contains the information about sent mail:

ls -ltr /var/log

you might see a file named mail.info. mail.info is used in this example.

• read your log file and see if other people use your mail server to send mail:

cat /var/log/mail.info | grep relay=

• verify that no bot has send mails from your computer:

cat /var/log/mail.info | grep -E "^.* .* .* .*: .*: to="