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Below an extract of the email header. From what I have gathered, the sender 51.15.81.111 is using my server to send out spam. What I still can't figure out is how, given I have disabled mail function, ban his IP and mail is not running on plesk for this domain. Anyone? Authentication-results...

Thanks GwenDragon. There are no mailboxes for the domain. Emails hosted with gsuite. So no email account hacked. I’ve disabled the contact form and removed the plugin altogether. For the malware, insecure plugin or infected php scripts, what scanning service could i used to test any...

Thanks Riculum. Here is the odd part, I have disabled mail function for the domain that was causing the issue but spam emails are still being sent! Any ideas as to why this is so?

Hi. I know this is an old post, but I am experiencing the exact same thing. Can someone please help me sort this out. I have secured plesk, but I am having trouble figuring out how to locate where these spam messages are being triggered from.