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Exchange 2003 outgoing mail stuck in queue

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Exchange 2003 outgoing mail stuck in queue - 19.Mar.2008 5:31:55 PM

akumudzi

Posts: 5
Joined: 15.Jan.2008
Status: offline

I'm running Exchange 2003 SP2 on server that also hosts my DNS.
Since yesterday all outgoing mail is stuck in the queue.

Under application events, I get:

Event Type:   Warning
Event Source:   MSExchangeTransport
Event Category:   Connection Manager
Event ID:   4007
Date:       3/19/2008
Time:       11:09:05 PM
User:       N/A
Computer:   MYSERVER
Description:
Message delivery to the host '217.15.120.17' failed while delivering to the remote domain 'ecoweb.co.zw' for the following reason: The connection was dropped due to an SMTP protocol event sink.
The SMTP verb which caused the error is 'mail from=*'. The response from the remote server is ''.

This is happening for all domains users try to send to.
Another thread in this forum recommended inserting our ISP DNS servers/resolvers as external DNS in the Default SMTP Virtual Server. I did. it didn't help.

I don't have any anti-virus on the server. Also, I unistalled GFI MailEssentials the day before as it was causing other problems so no anti-spam software on this server.
Checked DNS and seems ok. I ran DNSDiag.exe with: dnsdiag yahoo.com -d -v 1 and the results I get show everything is ok; It exits with 0.

I can do nslookups for any domain successfully.

I have checked all over for this kind of behavior but the solutions are not working:
http://forums.msexchange.org/m_180038400/tm.htm
http://www.experts-exchange.com/Networking/Email_Groupware/Exchange_Server/Q_21110083.html

About 3 hours ago I upgraded the Exchange from without-service-pack-at-all to SP2 but the problem remains.

The server is running Windows Server 2003 Enterprise Edition.

Please help

Post #: 1

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RE: Exchange 2003 outgoing mail stuck in queue - 19.Mar.2008 8:18:29 PM

g0x

Posts: 6
Joined: 14.Mar.2008
Status: offline

Check again your smtp port at firewall
Configure at your DNS the forwarders (ISP DNS)
Try to relay with ISP smtp server, using a smarthost
Try to use telnet commands to some smtp server, like your ISP

(in reply to akumudzi)

Post #: 2

RE: Exchange 2003 outgoing mail stuck in queue - 20.Mar.2008 4:58:51 AM

akumudzi

Posts: 5
Joined: 15.Jan.2008
Status: offline

thanks for speedy response g0x,

- Checked my smtp port on the firewall (ISA 2004). A rule is set to let through all outbound smtp traffic from the Exchange server to the Internet.

- Also checked for the second time the DNS fowarders, they're also configured fine to foward all DNS queries to my ISPs 2 DNS servers. Like I said this problem started 'suddenly'. Its been working fine and there hasnt been any inteference with it as far as i know.

- Unfortunately i cannot relay using smart host for the SMT virtual server. My ISP wont let me.

- I tried telneting from my network to my ISP's smtp servers and google and it fails with the following message:
telnet gmail-smtp-in.l.google.com 25
Connecting To gmail-smtp-in.l.google.com...Could not open connection to the host, on port 25: Connect failed

I think this is where my problem is, how do I resolve this?

(in reply to g0x)

Post #: 3

RE: Exchange 2003 outgoing mail stuck in queue - 20.Mar.2008 6:34:12 AM

g0x

Posts: 6
Joined: 14.Mar.2008
Status: offline

Check if your A.V or Isa Server isnt blocking port 25 or windows firewall
And BTW i cant also telnet gmail smtp are you sure thats the one?
Try to telnet this one mail.vodafone.pt 25

(in reply to akumudzi)

Post #: 4

RE: Exchange 2003 outgoing mail stuck in queue - 20.Mar.2008 7:35:31 AM

akumudzi

Posts: 5
Joined: 15.Jan.2008
Status: offline

thanks for the response
- My A.V is not blocking SMTP port 25. I have even disabled it completely on the ISA server but no joy.

I can telnet to Google fine from a different connection not inside my network. Tried telneting mail.vodafone.pt 25, same failure result.

I ran Exchange Best Practices Analyser on this server and there are the following error issues:

Sink registration not found: inboundsink
Transport event sink 'inboundsink' was found in the metabase for SMTP instance '1' on server myserver.mydomainname.org but its registration could not be found. Registration expected in:
HKEY_CLASSES_ROOT\CLSID\%SINKGUID%

Checking the ExchBPA recommendation on how to resolve this i got:

If the Exchange Server shows symptoms of mail flow problems such as message queuing, reregister the transport event sinks.

To reregister the transport event sinks
From the Microsoft Exchange Server, open a command prompt window and change to the \Program Files\Exchsrvr\Bin folder.

Type the following commands to re-register transport event sinks:

regsvr32 /i exps.dll
regsvr32 /i miscat.dll
regsvr32 /i onsubmit.dll
regsvr32 /i peexch50.dll
regsvr32 /i phatcat.dll
regsvr32 /i protolog.dll
regsvr32 /i reapi.dll
regsvr32 /i regsinks.dll
regsvr32 /i tranmsg.dll
regsvr32 /i turflist.dll
regsvr32 /i xlsasink.dll
regsvr32 /i msgfilter.dll

I tried registering the sinks and it gave me an error for all the sinks, e.g.:

"exps.dll was loaded, but the DllInstall entry point was not found. The file cannot be registered"

My problems remain.

(in reply to g0x)

Post #: 5

RE: Exchange 2003 outgoing mail stuck in queue - 20.Mar.2008 8:33:26 AM

g0x

Posts: 6
Joined: 14.Mar.2008
Status: offline

:S
Did you already tried to reinstall Exchange Service Pack 2?
I dont know if will help you on this, did you installed any Windows UPdate?
Spam Software? Outlook at Exchange Server?
I dont have much more ideias on this issue
Is that box exchange server and domain controler?

(in reply to akumudzi)

Post #: 6

RE: Exchange 2003 outgoing mail stuck in queue - 20.Mar.2008 1:47:53 PM

akumudzi

Posts: 5
Joined: 15.Jan.2008
Status: offline

Turns out the uninstallation of GFI MailEssentials 12 was a big mistake. apparently some dlls got unregistered in the process. An hour ago I installed GFI MailEssentials back onto this server and mail started moving out.
I'm surprised though. I guess everything everywhere is linked :-)

I had unsintalled MaillEssentials because it was randomly crashing restarting inetinfo.exe and IISAdmin, SMTP, and the Exch Routing Engine:
http://kbase.gfi.com/showarticle.asp?id=KBID002168
http://www.ureader.com/message/1291597.aspx
http://support.microsoft.com/?id=827214

I hope GFI will sort this out to allow for a clean uninstall of MailEssentials.

Thanks for the assistance g0x.

(in reply to g0x)

Post #: 7