Solved

Can't deliver mail with response 550 Sender Unknown

Posted on 2006-07-07
2
1,296 Views
Last Modified: 2010-08-05
I have a user trying to send to one particular address which refuses to accept the mail with the following response:

undeliverable to [recipient address]

Server response to MAIL FROM:
550 <[sender address]>, Sender unknown.

masquerade domain is same as nslookup for the ip number.

this is a piece of the smtp logs, firts the logs for the message that failes and after that logs of a message that can be delivered.
fail:
#Fields: date time c-ip cs-method cs-uri-query sc-status sc-bytes cs-bytes time-taken cs-version
2006-07-07 10:15:30 212.123.1.74 - 220+whalestone.com+ESMTP+MDaemon+8.1.4;+Fri,+07+Jul+2006+12:15:14++0200 0 71 0 47 SMTP
2006-07-07 10:15:30 212.123.1.74 EHLO mail.neeeds.com 0 4 0 47 SMTP
2006-07-07 10:15:30 212.123.1.74 - 250-whalestone.com+Hello+mail.neeeds.com,+pleased+to+meet+you 0 61 0 78 SMTP
2006-07-07 10:15:30 212.123.1.74 - 250-ETRN 0 8 0 297 SMTP
2006-07-07 10:15:30 212.123.1.74 MAIL FROM:<Admin@neeeds.com> 0 4 0 297 SMTP
2006-07-07 10:15:30 212.123.1.74 - 550+<Admin@neeeds.com>,+Sender+unknown 0 46 0 328 SMTP
2006-07-07 10:15:30 212.123.1.74 QUIT - 0 4 0 422 SMTP
2006-07-07 10:15:30 212.123.1.74 - 221+See+ya+in+cyberspace 0 24 0 438 SMTP
2006-07-07 10:16:16 80.242.238.134 QUIT - 240 524 4 781 SMTP

Notice the ETRN line.. what does it do there?

succes delivery:
2006-07-07 10:17:10 80.242.238.146 - 220+caius.dlwhosting.nl+(IMail+8.21+34366-5)+NT-ESMTP+Server+X1 0 63 0 0 SMTP
2006-07-07 10:17:10 80.242.238.146 EHLO mail.neeeds.com 0 4 0 0 SMTP
2006-07-07 10:17:10 80.242.238.146 - 250-caius.dlwhosting.nl+says+hello 0 34 0 0 SMTP
2006-07-07 10:17:10 80.242.238.146 MAIL FROM:<Admin@neeeds.com> 0 4 0 0 SMTP
2006-07-07 10:17:10 80.242.238.146 - 250+ok 0 6 0 0 SMTP
2006-07-07 10:17:10 80.242.238.146 RCPT TO:<me@soko.nl> 0 4 0 0 SMTP
2006-07-07 10:17:10 80.242.238.146 - 250+ok+its+for+<me@soko.nl> 0 32 0 0 SMTP
2006-07-07 10:17:10 80.242.238.146 DATA - 0 4 0 0 SMTP
2006-07-07 10:17:10 80.242.238.146 - 354+ok,+send+it;+end+with+<CRLF>.<CRLF> 0 39 0 16 SMTP
2006-07-07 10:17:10 80.242.238.146 - 250+Message+queued 0 18 0 16 SMTP
2006-07-07 10:17:10 80.242.238.146 QUIT - 0 4 0 16 SMTP
2006-07-07 10:17:10 80.242.238.146 - 221+Goodbye 0 11 0 16 SMTP
2006-07-07 10:18:17 80.242.238.134 QUIT - 240 639 4 782 SMTP
2006-07-07 10:20:18 80.242.238.134 QUIT - 240 754 4 781 SMTP

I wasn't and am not able to contact the admin of the receiving mail server.

Any help is appreciated to solve this asap.
0
Comment
Question by:Richard Frank
2 Comments
 
LVL 104

Accepted Solution

by:
Sembee earned 500 total points
ID: 17058024
I presume that you are neeeds.com ?

Everything looks fine on the DNS report.
http://www.dnsreport.com/tools/dnsreport.ch?domain=neeeds.com

And the IP address isn't listed either
http://www.robtex.com/rbls/80.242.238.152.html

This is something that the administrator of the email server needs to answer - as I cannot see anything wrong.
If this causing a business issue, then get your director to speak to someone high up at their end.

Simon.
0
 
LVL 1

Author Comment

by:Richard Frank
ID: 17071308
thnx Simon,

your presumption is correct. you confirm my thoughts, that the problem isn't with my mail server.

I wait for a little while and if no one hasn't anything to add to it, you'll get the points.

Regards,
Richard
0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Utilizing an array to gracefully append to a list of EmailAddresses
Read this checklist to learn more about the 15 things you should never include in an email signature.
In this video we show how to create an email address policy in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Mail Flow…
This video discusses moving either the default database or any database to a new volume.

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question