Spam qmail invoked from network

[administrator]

qmail #### invoked from network

The user was spamming under a compromised email account.

run the following command in the root

tail -f /usr/local/psa/var/log/maillog | grep '<IP_Address>' where <IP_Address> denotes the IP from which the spam is being generated

Lines containing the IP address will come up. you will find the user from which user the spammer was authenticating. Disable it.

If anybody is facing the same problem, follow the steps above and you are likely to catch the culprit.