Re: SMTP communication problem with the recipient's email server

From: Geoff Pearce (nemx02_at_magma.ca)
Date: 11/15/04 

Date: Mon, 15 Nov 2004 09:49:16 -0500

Spam Filters such as Nemx Power Tools for Exchange 2000/2003 are able to
drop SMTP sessions during transmission. Filtering is based upon RBL,
originating address, subject and invalid recipients.

The different recipients do they exist in the same domain as the one
returning the 550? If they are at different domains. Check if your
exchange server's IP has been placed inadvertently on an RBL (real time
blackhole listing) at www.openrbl.org. For more information about RBL
filtering check out.

http://www.nemx.com/solutions/rbl_popup.asp
http://www.outlookexchange.com/articles/JohnYoung/article1.asp

If the other recipients are all at the same domain then test with a
different email. Have you tried to send a different email (plain text
format with a simple subject and email body)? HTML emails have a higher
chance as being diagnosed as spam (spam contains high number of web links
for "click here" and graphics).

"wongcna" <wongcna@nospam.hotmail.com> wrote in message
news:%23QRCfAyyEHA.2804@TK2MSFTNGP15.phx.gbl...
> we are using SBS2000, SMTP connector is using ISP smtp relay server. One
of
> our user getting the following error immediately after he pressed his
"Send"
> button from his outlook 2003. He also got the same error when he tried to
> send to couple different recipient but the rest are ok. The problem only
> happened to him today. I do not receive any complaint from any other
people.
>
> There was a SMTP communication problem with the recipient's email server.
> Please contact your system administrator.
> <myserver.mydomain.local #5.5.0 smtp;550 Recipient Not Authorised
[recipient
> rejected due to no authorised destination groups]>
>
> I have tried to find the information o nthe internet but I could not
> naything.
>
>
>
> Thanks in advance!
>
>
>

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