Originally Posted by falko
You can create a secondary MX record for your domain pointing to the ISPConfig system. In ISPConfig you create a new site for that domain and the appropriate users (or a catch-all account).
That cannot be done with ISPConfig. You may have to invent something yourself to achieve this...
I thought when you had:
domain.com. 7200 IN MX 0 mail.domain.com.
domain.com. 7200 IN MX 5 backup.domain.com.
The backup.domain.com will keep the mail until mail.domain.com is back online, then pushes all mails back to the mail.domain.com and everything is done. People cannot receive mail from backup.domain.com..... or I'm misunderstand the MX record features....
So it cannot be done with ISPConfig, but it can be done configuring you DNS settings.
Edit: Hmmz, this is an old post.... noticed too late... sorry!