SEM stops sending emails on rule trigger

CIPHERZERO

I've got a run to send an email for EventType = UserEnable. We get around 120 of these a day, so it acts as a decent flag as to whether email alerts are working.

What's happening is around once a week SEM stops sending emails at all until I restart the manager via a PuTTY session. Once I do this all is well again.

We're on the latest edition of SEM and are running the appliance.

How do I begin to trace down what's going on? The rules are triggering and claim they've sent mail, but nothing appears.

The appliance isn't over-utilized at all, taking in only 600-700 EPS.

Thanks!

CIPHERZERO

Worked with an outside vendor on this - turns out SEM wasn't dealing with our smart host having multiple IP addresses. When the smarthost changed IP address to a different one, SEM loses its connection to the smarthost and silently fails to send emails.