Re: Domain of sender address does not exist

[Brian Longwe <brian at pch.net>]

It could also be a problem with reverse DNS resolution on the domain name
or unreachability of the name servers for the domain from some areas.

If you give us the domain name we can run some checks for you and let you
know....

Otherwise you can run some yourself using tools from www.traceroute.org

Longwe

On Wed, 9 Apr 2003, Brian Candler wrote:

> On Wed, Apr 09, 2003 at 11:44:55AM +0200, Alamicha Chapuma wrote:
> >    Please help !  One of our clients with their own domain is getting the
> >    error message " Domain of sender address [1]user at domain.com does not
> >    exist " when they try to send messages to some but not all email
> >    recepients.  What could be the problem and how do we rectify this.
> >    The error code is " Diagnostic-Code: SMTP; 553 5.1.8 "
>
> Well, probably it's exactly what it says: they are sending SMTP messages
> with
>          MAIL FROM:<somename at somedomain.com>
>
> but "somedomain.com" does not exist in the DNS. Many mail systems on the
> Internet refuse to accept mail from invalid senders; others do accept it.
> That's why it's not always failing. Or it may be that you have a DNS
> configuration problem for "somedomain.com", which means that randomly some
> people get a valid answer when doing a lookup on that domain, and other
> people do not.
>
> Would you care to say what the real domain name is? There are people on this
> list who can help you diagnose DNS problems.
>
> Regards,
>
> Brian.
>
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