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Some outgoing email being delayed and not delivered - Exchange 2003

Posted on 2006-05-26
Medium Priority
Last Modified: 2012-08-13
I have a Microsoft SBE 2003 Server with Microsoft Exchange, when email is sent out of this server my users starting getting delayed email messages (error 4.4.7), a day or 2 later the message does not get delivered.  This only happens with some addresses.

Reporting-MTA: dns;mydomain.com
Final-Recipient: rfc822;username@domainname.com
Action: delayed
Status: 4.4.7
Will-Retry-Until: Sat, 27 May 2006 13:54:50 -0700
X-Display-Name: user name

As a work around I am using my ISP outgoing mail server directly from the client and this is working.

Any suggestions?  The current setup has been working for months without trouble and has suddenly started.
Question by:randybell

Expert Comment

ID: 16770773
A fair amount of ISP will force you to relay e-mail through them.  I would contact the ISP to see if they have made any changes that now force you to do so.
LVL 26

Expert Comment

ID: 16771486
maybe the company that is not accepting your messages changed it's spam filtering rules and now you match as a spam source. Call this company and ask why your mail is not being accepted.

Author Comment

ID: 16772625
The ISP does not force relay email.  I have several people running their own smtp servers with the same ISP.   The DNS-BL seemed to be a possible cause, however when we use the same domain name on another server it works fine.
LVL 104

Accepted Solution

Sembee earned 500 total points
ID: 16777368
That NDR is just a delay message and is close to useless.
You need the fatal failure message to see what the error is.

However, if you were on a blacklist, then I would expect the message to be rejected immediately.
The remote domain could be using some kind of mis-configured grey listing (I am seeing that more often now).
There may also be dns issues.
Have you tested your DNS lookups to see whether they work?

For example... microsoft.com:

Default Server:  server.domain.co.uk

> set type=mx
> microsoft.com
Server:  server.domain.co.uk

Non-authoritative answer:

microsoft.com   MX preference = 10, mail exchanger = mailc.microsoft.com
microsoft.com   MX preference = 10, mail exchanger = maila.microsoft.com
microsoft.com   MX preference = 10, mail exchanger = mailb.microsoft.com

maila.microsoft.com     internet address =
maila.microsoft.com     internet address =
mailb.microsoft.com     internet address =
mailb.microsoft.com     internet address =
mailc.microsoft.com     internet address =
mailc.microsoft.com     internet address =

When you have the MX server information, see if you can telnet to port 25 of the remote server.

For example (using the above information)
telnet maila.microsoft.com 25


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