I’d argue that instead of a problem, it requires thinking about it differently.
email box with auto-responder
a) set a vacation message, this acts like an auto-responder, or
b) create an autoresponder, and set the autoresponder address as the “send copy to” for the e-mail box.
alias or group with autoresponder
a) create an autoresponder, and add the autoresponder address as a member of the e-mail group, or
b) create an autoresponder, and add the alias or group address as the “send copy to” for the autoresponder.
The way our client had it (the one we have just transferred from plesk).
It is a website of scouting club, with a lot of email addresses (board, administration, leaders etc etc).
the group ‘administration’ for instance has 10 members in it, and each mailbox is again an alias to a different adsres (not hosted with us).
The group has a auto responder with something like “thanks fot the email to the administration, you will get reply soon”.
Ech group also has a custom auto-respond message. (at the moment, quite a hassle to setup). A “vacation” message would in this case be the best solution i guess.
This setup actually uses zero “email boxes” and therefore zero vacation messages. If they actually do need e-mail boxes with pop3/imap/webmail access then it is more complicated, although doable - the alises would be email boxes instead with “send copy to” filled in with the “forwards to” addresses. I’m not sure why it would be set up that way though.
In the case of this particular client, you are correct. There are (with one or two exceptions) no real email boxes.
Basicly all addresses are forwarded to diferent addresses (i.e. hotmail, or national adsl/dialup isp’s).
(I hate to compare Interworx with Plesk, but thats the only panel we have used next to Interworx) … Plesk does not care if the address is an alias/redirect or whatever. It basicly (can) add an auto-respond message to every type of email address.
As you can see… quite a list with groups, redirects and auto-reponders.
(and even worse… since its a 7.0.x plesk, no email accounts where auto-created with the restore in Interworx :)… but that was to be expected…