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9.1

Exchange 2003 Rejecting Incoming Mail

Asked by robspot in Exchange Email Server, Simple Mail Transfer Protocol (SMTP)

Tags: Microsoft, Exchange Server, 2003

I have been looking at the following question which describes my problem exactly but I am having no luck following the solution.

http://www.experts-exchange.com/Networking/Email_Groupware/Exchange_Server/Q_21871906.html

Everything was running fine until yesterday at 11am GMT when the server started rejecting all external mail. I have made no changes to the system. The steps highlighted in the above link are

1. Looks to me like spam filter is not letting the mail through. Always the spam filter grabs the SMTP and then hands it over to exchange, since all of them are saying mailbox unavailable, have you tried to telnet a mail directly into the mailbox you are testing ???? Also what spam filter do you have ???

2. Also check the reverse DNS for your mx record ip to see if it exist. USe dnsstuff.com or dnsreport.com

3. If you can uninstall spam filter and check again if possible....

4. Enable complete logs on SMTP virtual server and send a mail from outside and go back and look at the log to see exact message exchange between the servers...

I am running Sophos PureMessage as my spam filter but I have uninstalled that and there is no change. I am behind a hard firewall but again I have removed that from the configuration and rebooted the server and no luck. One thing though, the normal NDR is:

Remote host said: 550 Requested action not taken: mailbox unavailable

but when I remove the firewall this becomes:

Remote host said: 550 5.7.1 217.146.176.90 has been blocked by ORDB_Relays

I am sending mail from Yahoo and another provider and both receive NDR's instantly. I don't know how to telnet into my mailbox so I haven't tried that yet.

I have used dnsstuff.com and there is no reverse DNS entry for my MX record! But seeing as it has always been like this (I guess) I'm thinking the problem lies elsewhere. There's other errors from the DNS report which I can post if you think it's relevant.

I have enabled logs on the SMTP Virtual Server and an example of one of my sent mails is

2008-03-27 08:05:09 217.146.177.82 web26915.mail.ukl.yahoo.com SMTPSVC1 MyServer MyIPAddress 26 0 HELO - +web26915.mail.ukl.yahoo.com 250 0 40 32 0 SMTP - - - -
2008-03-27 08:05:09 217.146.177.82 web26915.mail.ukl.yahoo.com SMTPSVC1 MyServer MyIPAddress 0 MAIL - +FROM:<me@yahoo.co.uk> 250 0 48 35 0 SMTP - - - -
2008-03-27 08:05:09 217.146.177.82 web26915.mail.ukl.yahoo.com SMTPSVC1 MyServer MyIPAddress 0 RCPT - +TO:<me@MyDomain> 550 0 0 36 110 SMTP - - - -
2008-03-27 08:05:09 217.146.177.82 web26915.mail.ukl.yahoo.com SMTPSVC1 MyServer MyIPAddress 0 QUIT - web26915.mail.ukl.yahoo.com 240 281 60 4 0 SMTP - - - -

Help will be very very very gratefully received.

View the Solution FREE for 30 Days

	Title
1	NDR Attacks
2	Block NDR for only one address in dom…
3	Exchange 2003: Sender address r…
4	After exchange NDR Attack
5	System Undeliverable Spam
6	Reverse NDR Attacks affect Linux???

Exchange 2003 Rejecting Incoming Mail

Asked by robspot in Exchange Email Server, Simple Mail Transfer Protocol (SMTP)

Tags: Microsoft, Exchange Server, 2003

About this solution