2008-03-19 21:34:39 UTC
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
Time: 11:09:05 PM
Message delivery to the host '18.104.22.168' 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:
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.