Track down the spammer in Qmail mail server:
1. Make sure that all domains have the Mail to nonexistent user option set to Reject.This option is available since Parallels Plesk Panel 7.5.3 and can be changed for all the domains using group operations: select the domains, click Modify Selected, in the Preferences section select Switch on for the Mail to nonexistent user option and select the Reject value for it.
2. Make sure that there are no untrusted IP addresses or networks in the white list.To do this, go to Home > Mail Server Settings > White List tab. To remove untrusted IP addresses or networks, select them in the list and click Remove Selected.
Look at the qmail queue for the number of mails. If the mail count too high, then it means, some spammer is roaming over there.
# /var/qmail/bin/qmail-qstat
messages in queue: 111976
messages in queue but not yet preprocessed: 0
From the qmail-qstat results we can see a huge mails are there in the queue. Next step is to identify the domain from which the mail is generating.
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