So basically I have setup some rules mainly for cases. Whenever a
serious case is created I want certain people within the organization
(MS Exchange server) to be notified. If I use an email address of
anybody within the organization it doesn't work, but if I use an
external account, like Gmail or Hotmail, the email is sent without a
problem. On the CRM server, in the Events log under Applications, I'm
getting a Usrenv Event id#1030 almost every 5 minutes, so not sure if
that would affect sending emails to people within the same Exchange
environment.

I'm lost and any help would be appreciated. I'm running the latest
version of CRM with all updates installed.

Cheers,

Mathew