Incoming emails are checked for viruses by ClamAV and for spam by Spamassassin. In the control panel you can also activate Greylisting, that will suspend emails for 5 minutes (by default).
ISPmanager uses Exim, however doesn't allow to configure most part of this server via the web-interface. You can edit configuration files if you wish.
By default Spamassassin only adds a spam message into the email heading. Mailbox user should decide what to do with such email himself.
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