postfix spam

Hello, I have a problem after hacking the server to send spam from my mailboxes. I have dozens or even hundreds of such processes all the time: I get a lot of alerts: lfd on bendlight.eu: High 5 minute load average alert - 6.40

need really help got a lot of spam massage OS ‪Ubuntu 14.04.5 LTS‬ Plesk Onyx Version 17.0.17 i never send spam emails to some one but a lot of emails 10000 end more if some want can help will be very thanckful Undelivered Mail Returned to Sender Dec 31 08:08:48 sd-100195...

Hi guys, Having an issue where we are getting constant spam on several domains within the same domain with a non-existent email. For example, [email protected] exists, but we are receiving emails to [email protected] by [email protected] or a random email (ie: [email protected]) The spam is...