Re: Re-post: SMTP 550 - Sender not allowed

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Date: 19 Aug 2004 15:54:23 -0700

Thanks for the reply Jeff!

Not sure what you're looking for regarding user account settings in
outlook... the issue occurs for sporadically at different times and
for different users, and occurs using Outlook or OWA.

We don't have the best DNS setup... split DNS... internal and external
DNS servers, same domain. On our internal network, MX record points
to private address of our mail server.

Don't know much about how the Worldsecure server is setup... only
thing we did on our Exchange server is to create a connector to route
e-mail to specific domains through Worldsecure.

Everything works fine most of the time, but every once in a while the
issue arises and someone will get bounce-backs with SMTP 550... the
person next to them can send no problem... then after a few attempts
the first person will get an e-mail through.

-Dave

"Jeff Mackeny" <me@me.com> wrote in message news:<OIavc4hhEHA.3816@TK2MSFTNGP11.phx.gbl>...
> Dave, what's the user account settings in outlook, where does the MX or A
> record for the source domain point to, can you explain in a little more
> details how DNS and SMTP is set up between the exchange and WorldSecure
> server.
>
>
> "Dave Woolley" <dvwool@ix.netcom.com> wrote in message
> news:c0b5e73d.0408181626.516c343e@posting.google.com...
> > This is a re-post... I originally posted this on 6/17/04 but didn't
> > get any response. I'm still experiencing this problem... does anyone
> > have an idea what might be causing it...
> >
> > Thanks in advance for your help!
> > -Dave
> >
> >
> > Hello,
> >
> > I'm trying to figure out a sporadic e-mail problem that has been
> > occurring for us for a few months now. Here's our setup...
> >
> > - one Exchange 2000 server
> > - single AD domain environment
> > - e-mail routed through Internet T1 by default
> > - Exchange is configured to route e-mail to some specific domains
> > through a backend T1... a partner has a WorldSecure server that acts
> > as a mail hub for all of those domains.
> >
> > About 25% of the time, sending e-mail to one of the "specially-routed"
> > domains results in the undeliverable message at the end of my post.
> > I've done some testing and the problem doesn't seem to be related to
> > time of day, content, or length of message. In researching newsgroup
> > postings, I read about reverse DNS being a possible issue, but I'm
> > sure that reverse DNS is set up properly for us.
> >
> > Something that dawned on me... the partner that acts as the mail hub
> > switched us from a frame relay to a T1-VPN around the time that the
> > problems started occurring... is it possible that it's a problem with
> > the access list on their new router or something like that?
> >
> > Any thoughts would be much appreciated.
> > Thanks!
> > -Dave
> >
> > ===================================================================
> > Your message did not reach some or all of the intended recipients.
> >
> > Subject: Test
> > Sent: 6/10/2004 12:49 PM
> >
> > The following recipient(s) could not be reached:
> >
> > 'user@otherdomain.com' on 6/10/2004 12:49 PM
> > There was a SMTP communication problem with the
> > recipient's email server. Please contact your system administrator.
> > <mailserver.mydomain.com #5.5.0 smtp;550 Requested action
> > not taken - Sender not allowed>
> > ===================================================================

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