Solved

Emails not sending with Exchange 2003 SBS

Posted on 2006-11-14
7
201 Views
Last Modified: 2010-03-06
I have a weird problem here. I have Exchange running on an SBS 2003 box. For some reason it won't send mail. it just sits in the queue for ages. I can't work out why the mail won't go. if I right click and select force connection nothing happens. There appears to be no errors in the logs even when I set logging on the exchange transport to maximum. It just sits there doing not a great deal. I pretty confused to be honest. I'm sorry I can't give any detailed errors, but there don't appear to be any! Can anyone help?

Cheers

Tanjuakio
0
Comment
Question by:tanjuakio
  • 3
  • 2
7 Comments
 

Author Comment

by:tanjuakio
ID: 17941694
Quick update, I've changed the delivery method to use a smart host (mailhost.zen.co.uk) this seems to have speeded things up. I'm still confused as to why though. I have a few servers setup with different customers all using SBS 2003 and the same ISP.
0
 
LVL 5

Accepted Solution

by:
lollygagr earned 500 total points
ID: 17942082
Do you have RDNS/PTR records set up for the external ip of your Exchange server?  Most email servers will try to look up the connecting ip in DNS, and if there are no corresponding records, they will treat your mail as spam and either block or defer delivery.  Here is a good overview article with instructions:  http://www.amset.info/exchange/dnsconfig.asp.

If DNS is set up as above, another possible issue is the DNS being used by your SBS servers.  What are they using for primary and secondary resolution, and are there forwarders set up?  I assume you can browse to the internet from these servers ...
0
 

Author Comment

by:tanjuakio
ID: 17942360
I don't know if an RDNS record is set for the sending IP. beings as the mx record would point to the customers email hoster and not the exchange server I'm guessing this wouldn't help? (Incoming email is handled by POP3). That would answer the question of why email started to flow when I set a smart host I guess.
0
 
LVL 5

Expert Comment

by:lollygagr
ID: 17982830
MX is the DNS record used for mail delivery, but a lot of sites have started looking for RDNS to try and cut down on the spam being delivered to them.  The reasoning is that zombied spambots and fly-by-nighters won't have RDNS set up ... it's a bit heavy-handed but fairly effective.  More and more sites have gone to using RDNS as one of their anti-spam tools, especially the big providers like AOL and Hotmail.   The fact that the mail started delivering when you switched to a smart host is a strong indicator that RDNS was the main issue.
0
 

Author Comment

by:tanjuakio
ID: 17986573
their email has been runnign ok for the past week or so (having said that I'll get a call now!) So I think it was due to RDNS. Not sure what to do with the points though.
0

Featured Post

Does Powershell have you tied up in knots?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Question has a verified solution.

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

This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled
How to resolve IMCEAEX NDRs in Exchange or Exchange Online related to invalid X500 addresses.
This video demonstrates how to sync Microsoft Exchange Public Folders with smartphones using CodeTwo Exchange Sync and Exchange ActiveSync. To learn more about CodeTwo Exchange Sync and download the free trial, go to: http://www.codetwo.com/excha…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

749 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