Exchange 2007: Messages Stuck in Outbound Queue. No inbound messages

I use a third party to filter my inbound messages.  We're not receiving any messages from the outside.

My outbound messages are stuck in the queue.

Any thoughts on where to start troubleshooting?

Thanks
OnsiteSupportAsked:
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MesthaConnect With a Mentor Commented:
If the OP is using a third party filtering service, then using the Microsoft test site isn't going to help.

This sounds like the port is blocked.
Are you using port 25 to exchange messages between your server and the remote service?
If so, can you telnet to the port of server that you route outbound email through?

telnet host.example.com 25

If the cursor just flashes then the port is being blocked, which would also explain why you have no email coming in.

Simon.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Stop all third parties AV or any other software. And once restart Microsoft Transport Service.
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OnsiteSupportAuthor Commented:
Stopped AV - Restarting transport had no effect.
Finally getting error messages in my outbound queue:

Message 1:

DNS Query Failed

Message 2:
451 4.4.0 Primary target IP Address responded with: "421 4.2.1 Unable to connect"  Attempted failover to alternate host, but that did not succeed.

Thanks



(not sure we have alternate host.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Is the DNS server up and is the Ad contactable. Is it possible to reboot the server once and make sure you disable the service for all third parties are set to start with manual.
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OnsiteSupportAuthor Commented:
Rancy-
DNS is up.
AD is contactable.

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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Can we once reboot the server
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Create a test account with mailbox and run the incoming email test in the Microsoft test site.
See what that flags and post the errors here for more help.

https://www.testexchangeconnectivity.com/

Rajith.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Is the port 25 for SMTP opened to receive and send mails
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
On the properties of the Send connector there would be a server name is that valid.
Also run the EXBPA and if there is any issue it will let us know, you can also run the Mail troubleshooter.
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