Need help with re-directs

[mdafforn]

I've got a domain (let's say domain.com) that hosts a drupal muti-site installation.

Currently we have domain1.com (the real site) on there with domain2.com, sub.domain2.com, and www.sub.domain2.com as serveraliases defined in vhost.conf (none of the serveraliases are listed as domains in plesk)

Is there a way to re-direct (hopefully perm) all the aliases to domain2.com?

I was thinking 301 re-directs, but it requires an .htaccess, and since these are all serveraliases, they have no directory to put an .htaccess file in.

Also, I need to make sure it's a plesk friendly solution, as most of the apache conf files are re-written everytime you make a change in plesk, and wipe out manual edits.

Thanks for any suggestions!