Since you're mapping email addresses to mailboxes, and not mapping them
to other email addresses, virtual_mailbox_domains is correct thing to use,
rather than virtual_alias_domains.

Postfix supports both TLS and SMTP AUTH (using Cyrus SASL).

I have no comments on the web access stuff.
--
Greg




Dave wrote:
> Hello,
> We've got an old sendmail box running on fc2 that we're going to be
> upgrading to postfix running on CentOS4. We host literally hundreds of
> domains, some with a single user others with multiple users. Currently our
> sendmail setup has each user with a Unix account, needless to say our
> password files are huge. We don't have a lot of overlap between usernames,
> i.e. we don't have two user1 users so currently that isn't an issue. I'm
> wondering given our setup, which would be better virtual alias or virtual
> mailbox domains? I'm leaning toward virtual mailbox, but would appreciate
> some practical experiences. In addition, a majority of our user's either get
> their mail via pop, i think now is the good time to add authenticated smtp
> with tls for this, and others prefer a webmail solution. We use usermin, (I
> did not set that up) and i want to move away from this. I'm thinking
> squirrelmail, but am not sure if it'll work with our virtual domains.
> Finally we'll be adding a web control panel so user's can administer more of
> their own accounts, plesk i was last told.
> I'm looking for any compatibility issues i might encounter with all
> this, any practical user experiences with this or similar setups, and any
> alternative webmail or setups to consider. I am particularly nervous about
> moving the customers away from sendmail, as i don't know it at all and not
> sure how it's set up, though i'll be relieved when it is done.
> Thanks a lot.
> Dave.
>
>