Any help on this subject is greatly appreciated:

I'm running a windows plesk 7.5.3 server.
I set up a domain with a couple of mailboxes, to this domain I added some domain aliases (full). Nothing special so far. HTML and FTP are working fine at all aliasses.
The problem is: any mail sent to mailbox@domainalias just disappears. it doesn't bounce, it doesn't arrive.

What is going wrong?

Quoting plesk help:
"Aliases could be of two types: full aliases or Web+FTP aliases. Web+FTP aliases make links only for Web and FTP resources of the existing server, while full aliases make links for Web, FTP, Mail and Tomcat resources."

 

run mchk --domain --domain-name=problemdomainname
However if it will not help you should upgrade.