This feels like it is just a coincidence, nonetheless ever since I did the SEPM update to 12.1.5337.5000 a few days ago on a customer network and rebooted the server, now I no longer receive email alerts from either SEPM and also from Backup Exec 2012. Each program is using a different email address to send their alerts (same domain though), and yet both are not working. I have changed no settings anywhere. However when SEPM finished and ran LiveUpdate, I think I saw some Backup Exec stuff in there. So maybe both got updated, and within those updates was some kind of change to how email security is handled?
Not sure if anybody has experience with Exchange 2010 but I went into my Receive Connectors. I have an internal-only one that receives mail from SEPM and BE. Port 25, internal FQDN, receiving on "all IPv4" addresses and listening for traffic only from the IP's of the servers on the network. So the IP filter list is ok. In terms of the Receive Connector's Authentication and Permission Gropups tabs, these are unchanged from before the SEPM update, and are:
Authentication tab: the only items checked are the TLS check (but not it's sub-checkbox), and the Externally Securied checkbox
Permission Groups tab: the only items checked are Anonymous Users, and Exchange Servers
I am wondreing if I should have Exchange users checked or not, seems it would make sense. I'll test later.
So maybe this is an Exchange issue, but I"m equally unsure of the SEPM situation. I have rebooted this server several times, and never had it that the email alerts from both Symantec products simultaneously stop. This would suggest Exchange is the single point of failure but perhaps LiveUPdate put in some kind of higher security requirement on the email settings therefore my ccurrent settings no longer function. ??
I'll try to find the SEPM logs - do a test email from the SEPM console and see if it generates anything.