I had email working on our 48k switches and we upgraded from 5.2.1a to 5.3.1a and now I don't get any emails. The way I got it working before was to edit the /etc/mail/sendmail.cf file and add our mailhost to the "Smart relay host" entry. Of course I had to go in and do this again after the upgrade, but it's not working this time.
I also have a valid MX record in the DNS that it is pointed to.
What am I missing? Could I possibly have a corrupt sendmail binary?
Here is what I have:
-r-sr-xr-x 1 root bin 448146 Apr 21 14:09 /usr/sbin/sendmail*