If our ISP is listed would this happen when sending email?

I would send an email and it would could back with Unknown User and then I
re-send it again and it would get through just fine. Sometime it would say
relay access denied and then I would re-send and it would work just fine.
How can I check to see if I am using my SMTP service to sent email out?

Thank
Tony


-----Original Message-----
From: Albert Duro [mailto:[EMAIL PROTECTED]
Sent: Thursday, October 19, 2006 7:50 PM
To: Exchange Discussions
Subject: Re: Still looking


It looks to me like you're sending out to a large list, some of which are 
getting bounced.  Is that right?

Like Dean says, you have to investigate each of the rejecting servers. 
Although in case of the 'relay denied' bounce, they may all have a common 
cause, such as:

-you or your ISP may be RBL listed
-you may not have, or not properly have, reverse lookup
-some of the senders/repliers may be sending from a non-routable address, 
like [EMAIL PROTECTED]

etc...


----- Original Message ----- 
From: "Dean Cunningham" <[EMAIL PROTECTED]>
To: "Exchange Discussions" <[email protected]>
Sent: Thursday, October 19, 2006 4:26 PM
Subject: RE: Still looking


Yep, but the actual one that includes the text:

smtp;550 5.7.1 Unable to relay
or
smtp;554 <[EMAIL PROTECTED]>: Relay access denied
or
smtp;550 5.1.1 <[EMAIL PROTECTED]>... User unknown

working backwards through the headers you can trace back which machines
the email passed through and identify the possible server causing the
problem

for the example below (which is your reply to me from this list) we can
see that:

It was sent from the list by intm-dl.sparklist.com ([64.62.197.83])
It was received by by a202-36-175-99.(none) (our firewall)
It was passed on to our AV SMTP gateway nrc15.nrc.govt.nz (Clearswift
SMTPRS 5.2.5)
It was then passed onto our exchange server nrc86.nrc.govt.nz

Once we can identify the sever where the "unable to relay " error came
from , then we can work in more detail with that server.


Microsoft Mail Internet Headers Version 2.0
Received: from nrc15.nrc.govt.nz ([202.36.175.39]) by nrc86.nrc.govt.nz
with Microsoft SMTPSVC(6.0.3790.0);
Fri, 20 Oct 2006 11:37:36 +1300
Received: from a202-36-175-99.isd (unverified) by nrc15.nrc.govt.nz
 (Clearswift SMTPRS 5.2.5) with SMTP id
<[EMAIL PROTECTED]> for <[EMAIL PROTECTED]>;
 Fri, 20 Oct 2006 11:37:31 +1300
Received: from intm-dl.sparklist.com ([64.62.197.83]) by
a202-36-175-99.(none); Fri, 20 Oct 2006 11:37:29 +1300 (NZDT)
Message-ID: <snip>
From: Tony Nguyen <[EMAIL PROTECTED]>
To: "Exchange Discussions" <[email protected]>
Subject: RE: Still looking
Date: Thu, 19 Oct 2006 15:31:35 -0700
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