Antonio Di Monaco wrote:
To save privacy, I put KNOWN_USER@CORRECT_DOMAIN as a valid email address,
and UNKNOWN_USER@CORRECT_DOMAIN as a non-existent email address, even if
the domain is correct and is equal in both addresses.
Do you really want to make it difficult for people to help you?
---------------------------------------------------------------------------
UNDELIVERABLE MAIL
Your message to the following recipients cannot be delivered:
<UNKNOWN_USER@CORRECT_DOMAIN>:
<<< 550 User unknown.
---------------------------------------------------------------------------
Of the three common possibilities that I mentioned before, that looks an
awful lot like the sort of thing that you'd see from a backup MX that
doesn't check users. Is it?
If so, I recommend dropping the backup MX. They're not useful, and they
cause this exact problem, among others.
If you insist on a backup mx, set up your domain as a "hosteddomain" and
write a script that builds a list of all of the valid recipients of that
domain and converts it into an alias file, directing mail to the primary MX.
---------------------------------------------------------------------------
UNDELIVERABLE MAIL
Your message to the following recipients cannot be delivered:
<KNOWN_USER@CORRECT_DOMAIN>:
<<< Mail loop - already have my Delivered-To: header.
That's an entirely different issue, and as Marcin pointed out, more
difficult to solve. I see those from time to time, but they're pretty
rare. I expect that the former messages make up the bulk of the
deliveries to your postmaster account.
10 messages in net.sourceforge.lists.courier-usersRe: [courier-users] Filter some postm...
