Preventing MX record fallback  view story
http://serverfault.com – I have a website, example.com, running
on a Windows 2008 server with IIS 7 and the "IIS 6" SMTP
service. The website regularly sends out emails to
info@example.com. In rare instances, the MX record lookup for
example.com fails, and so the SMTP service falls back to the A
record, which I understand is expected behavior. However, this
is not desired behavior, since the mail server for example.com
is on a different machine, so the occasional email bounces.
What's the best way to prevent this? EDIT: My DNS setup looks
like this: A - example.com -> A - mail.example.com -> (HowTos)