Re: SMTP communication problem

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OK, I ran nslookup against the problem domain and got the following:

*** Can't find server name for address 192.168.0.30: non-existent domain
Server: unknown
Address: 192.168.0.30

Non-authoritative answer:
problem.com MX preference = 20, mail exchanger = smtp.problem.com
problem.com MX preference = 20, mail exchanger = voodoo.cypresscom.net

smtp.problem.com internet address = XXX.XXX.XX.XX


I'm not sure where the 192 address is coming from, it shouldn't be internal
like that should it?

I can telnet into voodoo.cypresscom.net and get a login prompt, but don't
get anything trying to telnet to smtp.problem.com




"Jim McBee (MVP)" wrote:

> From the console of your server, do a little troubleshooting. Use NSLOOKUP
> to determine the IP address of the domain you are trying to send to. Such
> as:
>
> nslookup -q=mx problemdomain.com
>
> Once you have got the name of their remote server (let's say it is
> smtp.problemdomain.com), use TELNET and see if you can establish a session
> to their server. Like this:
>
> telnet smtp.problemdomain.com 25
>
> Do you get a banner for their SMTP service? Anything unusual?
>
> Also, try increasing the SMTP Protocol diagnostics logging found on your
> server's properties. See if anything additional shows up in the
> "JL Adamson" <JLAdamson@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:1F5A33F4-F344-4F93-9922-08A23CFB72C2@xxxxxxxxxxxxxxxx
> > We are running Exchange 2003 on a Windows 2003 server. Each day we have no
> > problems emailing between literally dozens of different email addresses
> > and
> > users. However, with one particular user we are getting bounceback emails
> > whenever we try to send them an email. The message reads:
> >
> > There was a SMTP communication problem with the recipient's email server.
> > Please contact your system administrator. <local domain #5.5.0 smtp;554
> > <recipient email address>: Relay access denied>
> >
> > I have checked to make sure we are not on any RBL. Is there anything I can
> > do on this end to fix this or are we victims of the whims of the
> > recipient's
> > email server blocking us?
>
>
>
.

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