Suddenly stopped receiving external email

[Jawloms]

As far as I am aware, nothing has changed but this morning we have stopped receiving any external email. We can send externally, internally all is fine. Exchange 2010 SP3 hybrid setup (yes I know, I'm currently working on migrating everyone up to the cloud. So far the only migrated accounts are test ones). Restarted services, and the server. MX records still look correct. No NDRs, although obviously these could take a day or two to start which I'd rather not wait to sort the problem! Where do I go next please?

 

Stuart

[computer_expert]

Have you installed the patches for the recent exchange zero day? (2010 had a patch released)

 

Can you telnet to port 25 of your mail server from another internet connection?

Edited March 15, 2021 by computer_expert

[Jawloms]

Patches applied when first released.

 

Telnet gives this;

220 DHS-Exchange.debenham-cc3.internal Microsoft ESMTP MAIL Service ready at Mon , 15 Mar 2021 12:07:55 +0000

[Jawloms]

Also - Freed up some disk space and now appears to be working........