SMTP fails with no errors

[ams_corp]

The SMTP service fails with no errors written to the logs. The application continues to run and the SMTP service shows as running, however the service stops responding to outside requests. We are running version 2.63 --

[rob]

Its possible an AV filter (most likely), firewall or SPAM filter are intercepting the port 25 requests and preventing them reaching the mail server. I would recommend you disable any automated scannin software temporarily to see if the issue resolves its self (you may need to reload the mail server or even reboot the server). It is also possible a router is preventing your SMTP connections and so it would be worth checking your router/modem settings.