mail queue full of bounced emails from [email protected]

Last week one of our shared servers mail queu reported over 2000 emails in queue to be delivered to [email protected] Searching google about it yield no result. I tracked down the origin of the emails to a customer’s wordpress blog and It turned out that

a nulled pirated plugin from codecanyon (possibly infected with malware) has been sending emails constantly to¬†[email protected]

I am not sure what was the purpose of the emails, if it was an attempt to flood the mailbox or a “call home” feature but disabling the plugin solved the issue for us.

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