Hi DimitrisM,
Plesk provides articles with solutions/work-arounds in the
Odin/Parallels KnowledgeBase. Due to the case that you don't provide any log - files, nor any configuration files, it is hard to guess, what the cause of your issue(s) are. We really would like to help in case of issue(s), but your problem description isn't giving any facts, where we could start investigations from, to find the cause of your issue(s).
Other usefull links for you, if you don't want to provide log - files / configuration - files here in the forums:
Dokumentations:
Forums - Search:
First advice:
If SPAM is sent from an eMail - Account, change the password for this eMail - Account immediately, or/and even consider to lock the depending account(s).
Check your eMail - server configuration and forbid relaying without authentifications.
Use sites like "
http://www.mxtoolbox.com" and "
http://www.mail-tester.com/" to test your server and it's configuration(s).
If you identified PHP - scripts to send SPAM, consider the suggestions from:
If you would like to help from the forum, you really have to post facts, log - files, configuration - files and other sorts of informations, which helps to investigate your issue(s). Guessing doesn't help at all and just cost a lot of time ( not only from you, but as well from the people willing to help you! ).