Re: [exim] CNAME and recipient rewriting

On Sun, Oct 10, 2010 at 08:26:24PM +0200, Matthias-Christian Ott wrote:
> Hi,
>
> 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 bob@??? to
> bob@???, 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.

Regards,
Matthias-Christian