Re: Unable to Relay

Hi,

Have you checked your relay internally? Simply telnet to your exchange box on port 25 using the command:

c:\telnet <exchange server> 25

Wait for the SMTP header then type (each line after the server responds):

HELO blah.blah.blah
MAIL FROM: test@xxxxxxxxxxx
RCPT TO: test@xxxxxxxxxxx
DATA
blah This text will appear in the mail message.
<blank line>
.
<blank line>
QUIT

the <blank line>'s are simply hitting the enter key, you can play with different MAIL FROM's and RCPT TO's to test relay and sending to internal parties.

I would perform this test firstly on the inside of the network against the exchange server and then secondly against the firewall. Should exchange wish to block you a message normally appears after the RCPT TO command.

This should just help narrow down where the problem is, also I've found in the passed that you may get a response here which is more descriptive than the bounce email.

Hope this helps.

Regards
 Steven

From: "Newhouse, Christina C." <CCN@xxxxxxxx>
Reply-To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Subject: [isalist] Re: Unable to Relay
Date: Mon, 4 Feb 2002 15:50:28 -0500
No, ISA is running on a Windows 2K box and Exchange is on a Windows NT4 SP6
box.

-----Original Message-----
From: Gabriel Zabal [mailto:gabriel@xxxxxxxxxxx]
Sent: Monday, February 04, 2002 3:46 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Unable to Relay


http://www.ISAserver.org


Are you running Ex and ISA on the same server ?

Gabriel Zabal
gabriel@xxxxxxxxxxx


----- Original Message -----
From: "Christina Newhouse" <ccn@xxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Monday, February 04, 2002 12:26 PM
Subject: [isalist] Unable to Relay


> http://www.ISAserver.org
>
>
> For the last two weeks, after we rebooted our Exchange 5.5 server, we were
> unable to receive inbound e-mail. However, we could send emails and we
> had interoffice e-mail. The NDR states the following:
>
> The following address had permanent fatal errors - (ccn@xxxxxxxx)
>
> ...while talking with mail.tpgl.com:
> >>>RCPT To:<ccn@xxxxxxxx>
> <<<550 Unable to relay for ccn@xxxxxxxx
> 550 <ccn@xxxxxxxx>...User unknown
>
> After I reboot the Exchange server, ISA server and stop and restart the
> IMS service and SMTP service on Exchange numerous times, we will suddenly
> start to get inbound e-mails again. It's a mystery to me.
>
> Thanks for any advice or suggestions!
>
> Tina Newhouse
> 


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