I just installed Turnkey Drupal and migrated a site from a hosting provider. The only issue I'm having is sending/receiving email from the site. Sorry if these are dumb questions, but:

1) Do I need to mess with Postfix to get mail working with Drupal? or 

2) Is the issue with my network? (The computer with Turnkey sits behind a router, which has the following ports forwarded: 21, 22, 25, 110, 443, 12320, 12321, 12322). OR

3) Is it something else I'm blind to?

Thanks for any help or advice anyone can give.