On 10/10/2010 19:41, Matthias-Christian Ott wrote: >> I recently got notified from a mailing list which is mangaged with >> ezmlm that E-Mails could not be delivered because my mail server >> rejected them. It turned out that the SMTP server or ezmlm itself >> rewrote the recipient of the envelope from [email protected] to >> [email protected], because example.com was a CNAME for b.example.com. >> >> Is such rewriting compliant with any standard (according to the >> rejectlog no other E-Mails got rejected for this reason)? > > As more E-Mails come in, it seems very likely that some SMTP servers > got confused by the CNAME and as far as I can tell from the logs > didn't even try to deliver the E-Mails to my server.
If your MX record is pointing at a CNAME, then your DNS is broken. MX records are not allowed to point at CNAMEs, they're only allowed to point at A records. -- Mike Cardwell - Perl/Java/Web developer, Linux admin, Email admin Read my tech Blog - https://secure.grepular.com/ Follow me on Twitter - http://twitter.com/mickeyc Hire me - http://cardwellit.com/ http://uk.linkedin.com/in/mikecardwell -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
