Sendmail: Virtusertable and MX
I witnessed an interesting behavior today in sendmail. I have an entire email domain mapped to a single user in
MX record pointing that domain to my host went away, leaving only a
CNAME record aliasing domain.com to the name of my host, sendmail stopped recognizing the entry in
Sendmail was checking against my local user database directly, instead of
A record would have made sendmail recognize it, and it was just the
CNAME breaking it.
Filed Under: Linux