virtual mail not working, regular mail working

[Jim Reid]

>>>>> "Tonnere" == Tonnere de Brest <x at y.z.com> writes:

    Tonnere> I get: 
    Tonnere> 553 gometric.org. config error: mail loops back to me (MX problem?)  
    Tonnere> 554 <root at gometric.org>... Local configuration error

This is not really a DNS problem. Your mail system is misconfigured.
The DNS is telling the world to deliver mail for gometric.org to your
mail system, but that mail system does not know that it is expected to
accept mail for the gometric.org domain. The sendmail FAQ explains how
to solve this problem. [If you're running sendmail of course, which
you seem to be judging by the error message you've quoted above.] You
add the name gometric.org to the sendmail.cw file - if sendmail uses
that file - or by adding a line like "Cw gometric.org" to sendmail.cf.

Here's the relevant bit of that FAQ:

Subject: Q4.5 -- How can I solve "MX list for hostname points back to hostname"
and "config error: mail loops back to myself" messages?

   Date: January 17, 1997
   Updated: November 5, 1997

   I'm getting these error messages:
        553 MX list for domain.net points back to relay.domain.net
        554 <user at domain.net>... Local configuration error

   How can I solve this problem?

   You have asked mail to the domain (e.g., domain.net) to be forwarded
   to a specific host (in this case, relay.domain.net) by using an MX
   record, but the relay machine doesn't recognize itself as domain.net.
   Add domain.net to /etc/sendmail.cw (if you are using
   FEATURE(use_cw_file)) or add "Cw domain.net" to your configuration
   file.