Email shows date in the past?

[eluser]vanquish[/eluser]
I checked another server that I am running CodeIgniter on, and the emailing sending is working fine on that one.

Dates on the 2nd server are showing as Date: Mon, 23 Aug 2010 12:14:32 -0600

I ran date('r') in a PHP file on the problem server and it gave me this:

Tue, 24 Aug 2010 19:05:05 -0600

So the server time is set correctly, but somehow CodeIgniter screws up the email headers!