To detect potential spamming activity on a server, you can use a few simple commands. Start by checking the email queue with:
exim -bpc
If the number increases rapidly, it could indicate ongoing spam activity. You can also monitor outgoing emails in real-time by using:
tail -f /var/log/exim_mainlog
However, sometimes clients may send spam through scripts, in which case you might not see errors in the Exim logs. To catch script-based spamming, monitor system messages with:
tail -f /var/log/messages
or check for suspicious processes using:
ps aux | grep dm.cgi
Regularly monitoring these logs helps in early detection and prevention of spam, protecting your server’s IP reputation and ensuring smooth email delivery.