Re: [courier-users] Filter some postmaster messages

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.


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