The message never reaches John's server, and there is no mention of it in the logs. I am going onsite to Fred, and check that out there.
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550 5.1.1 User Unknown error (but the user is known)
I have a client ("John") who is having troubles receiving email from one particular person ("Fred"). When Fred emails John, or anyone at John's company, he gets this email message back:
Your message did not reach some or all of the intended recipients.
Subject: (subject)
Sent: 2/19/2004 3:15 PM
The following recipient(s) could not be reached:
'John' on 2/19/2004 3:15 PM
550 5.1.1 <john@domain.com>... User unknown
Everyone else in the world can mail John. I have checked and double checked the spelling, etc.
We are currently using 'IMail', but have been assured by their tech support that the problem is not at our end.
Any input, etc. would be appreciated.
Thanks,
TN
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Answers
Dealing with Exchange 2003 - iMail users cannot send to us - most of the time get multiple messages in one - does not seem to reach the server - I think it is a protocol or security issue with 2003 which is set to be much more "together" with regards to security: see below.......
The original message was received at Wed, 12 May 2004 11:29:40 -0500 (CDT) from localhost [127.0.0.1] (this is from the iMail)
----- The following addresses had permanent fatal errors ----- <"John">
(reason: 550 RCPT TO:<John> User unknown)
----- Transcript of session follows ----- ... while talking to mail.johnsserver.com:
>>> DATA
<<< 550 RCPT TO:<"john"> User unknown 550 5.1.1 <"John">... User unknown
<<< 554 DATA Transaction failed, no recipients given
My John - has no problem with mail in either direction - but several of Fred's company users have had problems. It is most of the time - but has worked on occasion.
Thoughts????
I'm having a similar problem but think I know what the problem is.
I think the mail is being bounced because of a reverse lookup failure
we have a similar problem with one of our domains
I recently started relaying our mail through an external server that we have control over
rather than our ISP's mail systems (long story)
Certain servers when receiving mail perform a check on the last server IP that the mail was relayed through and check to see whether it matches the reverse IP lookup on the senders domain.
Even though I have an MX forwarder record set up to point to my relay server
the actual domain <blahblah.com> still resolves back to my ISP's domain.
I still have some more work to solve this issue, but i feel i'm going in the right direction
Will be trying suggestions posted here
http://www.interact-sw.co.
1.2.3.4 does not like recipient.
Remote host said: 550 5.1.1 <jason@domain.com>: Recipient address rejected: User unknown in relay recipient table Giving up on 1.2.3.4 (my external email server IP).
I reckon that is because of the email domain <meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="ProgId" content="Word.Document"><m
CMIIW
Sorry for the broken HTML format.
1.2.3.4 does not like recipient.
Remote host said: 550 5.1.1 <jason@domain.com>: Recipient address rejected: User unknown in relay recipient table Giving up on 1.2.3.4 (my external email server IP).
I reckon that is because of the email domain where the email coming from is in one of the RBL ? block listed.
CMIIW
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by: ridPosted on 2004-03-05 at 00:08:17ID: 10520750
This should be logged by iMail, if the server actually gets the incoming message and rejects it. Does the log say anything interesting? I think you can adjust the level of details that are logged and you may have to use the most detailed level here.
If "Fred" cannot send mail to anyone at "John's" company, the problem is probably not with "John" but rather at "Fred's" end. Perhaps his domain has been blocked. Look in the Kill list. Also "Fred" may benefit from a look in the mail server log at his end. These error messages can be less-than-perfect when they state the problem. The returned message to "Fred" must have headers, too. Is it possible to determine if the original message ever reaches "John's" server before it bounces?
/RID