Problem with Webform and getting email notifications

I considered posting this in the issue queue but it's been open for a year and a half and thought maybe someone here has fixed it.

I'm working on a contact page using Webform and have it set to email the submissions to appropriate email addresses. The problem is that they aren't being sent. I tried the workaround of blanking the From name but that didn't work either. I should have prefaced this with the fact that I have received other emails (such as the super user login info) just fine.

The main difference I think is that the emails that are getting through from Drupal are using the php mail function (which I believe uses sendmail) where as the Webform emails attempt to use postfix. While using postfix it attempts to make a SMTP connection to the servers of the To: address. mail.log file entry below

Any ideas?

P.S. this is all being done on my Mac via MAMP