error 5.5.0 smtp 551 not our customer

Gary Massengale · Joined: 05 Aug 2007 Posts: 8

got the error below when sending to a comcast.net email account.

It is a user's home email address, and he swears the address is correct, but
this appears to me to indicate that the user does not exist? Or is it some
kind of relaying error?

There was a SMTP communication problem with the recipient's email server.
Please contact your system administrator.

Archived from group: microsoft>public>exchange2000>connectivity

Kip Ng [MSFT] · Joined: 05 Aug 2007 Posts: 6

5.5.0 is a generic error.

"551 not our customer" is a respond from the remote server.

Try doing a telnet and nslookup and make sure that it is pointing to the
right mx and it can establish a smtp connection.

Receiving 5.5.0 Non-Delivery Reports from Specific Domains Only
http://support.microsoft.com/?id=300171

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"Gary Massengale" wrote in message@TK2MSFTNGP09.phx.gbl...
> got the error below when sending to a comcast.net email account.
>
> It is a user's home email address, and he swears the address is correct,
but
> this appears to me to indicate that the user does not exist? Or is it
some
> kind of relaying error?
>
> There was a SMTP communication problem with the recipient's email server.
> Please contact your system administrator.
> >
>

Gary Massengale · Joined: 05 Aug 2007 Posts: 8

thanks for the reply.

Funny thing is, it cleared up on its own. One person here was sending to a
comcast email account and got this error, I sent to the same account, same
error. 30 minutes later I send to my personal comcast account and it
works,then ask the user to try again sending to the one that was returning
the error, and it worked as well. I guess the issues were on the comcast
server?

gary

"Kip Ng [MSFT]" wrote in message@tk2msftngp13.phx.gbl...
> 5.5.0 is a generic error.
>
> "551 not our customer" is a respond from the remote server.
>
> Try doing a telnet and nslookup and make sure that it is pointing to the
> right mx and it can establish a smtp connection.
>
> Receiving 5.5.0 Non-Delivery Reports from Specific Domains Only
> http://support.microsoft.com/?id=300171
>
> --
> This posting is provided "AS IS" with no warranties,
> and confers no rights. Use of included script samples (if any)
> are subject to the terms specified at
> http://www.microsoft.com/info/cpyright.htm
>
> * Please do not send e-mail directly to this alias.
> This alias is for newsgroup purposes only
>
>
> "Gary Massengale" wrote in message
> @TK2MSFTNGP09.phx.gbl...
> > got the error below when sending to a comcast.net email account.
> >
> > It is a user's home email address, and he swears the address is correct,
> but
> > this appears to me to indicate that the user does not exist? Or is it
> some
> > kind of relaying error?
> >
> > There was a SMTP communication problem with the recipient's email
server.
> > Please contact your system administrator.
> > > >
> >
>
>

Sriram.V · Joined: 06 Aug 2007 Posts: 1

Hi Gary

This behavior occurs if the destination server cannot resolve the domain
that you are using as your return address. For example, if your server's
domain is "nonexistantdomain.com," and you are trying to deliver a message
to a domain called "destinationdomain.com," and this domain has Reverse
Lookup enabled on its SMTP server, mail delivery will fail. This occurs
because the destination server will perform a reverse lookup on
"nonexistantdomain.com," and then it will stop the SMTP conversation.

Reverse Lookup causes additional overhead on servers, but is commonly used
to help prevent environments from getting unsolicited e-mail messages
(spam).

If you want to verify that this is the problem you are having, telnet to
the remote server's SMTP port, and attempt an SMTP conversation

For information on how to telnet port 25 check this link

http://support.microsoft.com/default.aspx?scid=kb;EN-US;153119

Thank you
Regards

v-srirav@online.microsoft.com

This posting is provided "AS IS" with no warranties, and confers no rights.

--------------------
| From: "Gary Massengale"
| Subject: error 5.5.0 smtp 551 not our customer
| Date: Tue, 22 Jun 2004 10:44:34 -0400
| Lines: 11
| X-Priority: 3
| X-MSMail-Priority: Normal
| X-Newsreader: Microsoft Outlook Express 6.00.2800.1409
| X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409
| Message-ID:
| Newsgroups:
microsoft.public.exchange2000.connectivity,microsoft.public.exchange2000.gen
eral,microsoft.public.exchange2000.misc
| NNTP-Posting-Host: mail.jacksonfurnind.com 68.114.160.34
| Path:
cpmsftngxa10.phx.gbl!TK2MSFTFEED01.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP09
phx.gbl
| Xref: cpmsftngxa10.phx.gbl microsoft.public.exchange2000.general:57040
microsoft.public.exchange2000.misc:13445
microsoft.public.exchange2000.connectivity:18249
| X-Tomcat-NG: microsoft.public.exchange2000.general
|
| got the error below when sending to a comcast.net email account.
|
| It is a user's home email address, and he swears the address is correct,
but
| this appears to me to indicate that the user does not exist? Or is it
some
| kind of relaying error?
|
| There was a SMTP communication problem with the recipient's email server.
| Please contact your system administrator.
| |
|
|

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