Something is sending spam emails from random generated emails @mydomain

Hi guys,

I'm quite new to WHM, i've upgraded a few months ago from shared hosting to unmanaged vps, and today i've got an email from my webhosting provider stating "We have received a spam report regarding your server with us and we need you to investigate it and fix the problem in question."

unfortunatley it's an "unmanaged" vps, so i wont get significant help from the webhosting company, and i thought i try here too, maybe you could give me some guidance on how to fix this.

Here is a print screen of the Mail delivery reports in WHM: /http://puu.sh/aO2el/9f64cad2dd.png (they are about 42 pages only for August 11th)

thank you in advance for any infos,

Filip

 

Hi,

right now, after browsing the forum, i've set the default adress like this: /http://puu.sh/aO6X9/32898c0688.png

and also enabled SMTP Restrictions.

Now, after all that, in the email delivery reports i have something like this: /http://puu.sh/aO7aE/b3f254419a.png (still trying but not succeeding i think)

 

Hi,

thank you for your reply, and im sorry for the inconvenience,

from the "Prevent Email Abuse" page i've done the followings:

- Enable SMTP Restrictions
- Restrict the nobody system user's send mail permissions
- Configure high failure rate protection

and this is what i have now in the "Mail Delivery Reports":



every minute, between 4 and 10-12 (unsuccesful) tryouts.