exchange 2007 stopped sending and reciving external email

By ktaylor2121 ·
I have an exchange 2007 single copy cluster that has been up and running for almost a year now. We have 1 hub transport server, we do not use an edge server, and we have 2 servers clustered for the information store, node1 and node2

Today it has stopped sending and receiving external email. I have checked to make sure all the services are running on the hub transport and clustered servers. I have also done a restart on all the servers. I am able to connect to the smtp connector via telnet ( telnet 25 , sent ehlo and got a response). The mail Que is backing up for external email, but all internal email is being delivered.

I have double checked our mx records and they are responding with the correct public IP address.

I am at a loss, please help!

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Couple of questions

by mafergus In reply to exchange 2007 stopped sen ...

1. Did anything change recently? Either to the mail server, AD or any other servers/services such as routers/firewalls?

2. what did the diags give you?

Test-ServiceHealth or Test-SystemHealth

in powerscript?

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