feat: allow a catchall alias to be used

[cjpit]

No description provided.

[Hobby-Student]

tried this on a current install and it works for manually added email addresses. Unfortunately it doesn't work on LDAP synced users, I also tried

proxyAddresses = smtp:@domain.tld

I try to find the LDAP sync filter and perhaps can submit another pull request

EDIT: just FYI

change

admin-api/services/ldap.py

Line 137 in fef7240

userdata["aliases"] += [alias for alias in aliases if formats.email.match(alias)]

to

userdata["aliases"] += [alias for alias in aliases if (formats.email.match(alias) or formats.email_domain.match(alias))]

see next post for details

[Hobby-Student]

this solution sounded very nice and simple. Unfortunately it's not a last resort catch all, it's a primarily catch all. This is what my quick tests have shown.

I tried to solve a problem like "AD user gets deleted, but incoming mails need to be delivered for the old address in a catch all mailbox". Not possible with this pull request.
For me, this needs some more digging to become something like "no address found, lets check this user as last resort"

[robert-scheck]

Unfortunately it's not a last resort catch all, it's a primarily catch all.

From my point of understanding, this is a Postfix configuration issue; citing: https://serverfault.com/a/1094145:

The important part is that all real mailbox users are also put into the virtual alias lookup. This works around the fact that aliases have priority over real accounts. So it's not about the order of the entries, or whatever your mydestination is set to, you just have to add your real mailboxes as aliases, too, and the catchall will work as intended and only collect the mail for the undefined addresses.

Unfortunately, this seems to be a quite common configuration mistake (that I also run into already).