Regenerating expired mail.crt?

[Philip Prindeville]

Sorry if this is a FAQ candidate...  I dug a bit and couldn't fit a 
suitable answer...

How do I reconstruct an expired mail.crt file?  As I remember, the cert 
was originally generated automatically by the .spec when I installed 
some package or another, but I can't figure out which it was or I'd just 
peek into the .spec and repeat it again.

Thanks,

-Philip