Eric Cunningham wrote:
I want e...@sanguine.whoi.edu to continue delivery to my imap account. In fact, that happened perfectly in my previous postfix configuration.
... it worked previously due to a bug in permit_mx_backup. That bug has been corrected.
Since upgrading postfix, in order for that to continue working, I'm now hearing that I must specifically list sanguine.whoi.edu "somewhere" in my postfix configs.
Yes.
That's not unreasonable, but let's now extend this example to another 250 hosts that are in a similar situation. I must now specifically find, list and maintain all of 250 of those in some postfix config file
Correct. You can configure wildcard subdomains to be delivered all to one location if that's appropriate for your configuration.
and that there's no other way this will work as before? That, to me, seems rather unreasonable. Doesn't postfix have the capability to look up MX records for that purpose?
Postfix can behave as an automatic backup/secondary MX using permit_mx_backup and protected by permit_mx_backup_networks, but this specifically excludes domains that list you as the primary MX, unless those domains are already configured in one of the postfix address classes.
http://www.postfix.org/postconf.5.html#permit_mx_backup http://www.postfix.org/postconf.5.html#permit_mx_backup_networks -- Noel Jones
