John,

I mentioned at the end of this post that I was also unable to get BCC working: “Unfortunately, this method does not work for BCCing users. I wonder if BCCing is even possible with PEAR Mail or if I’ll need to find something else.”

None of your examples had any BCC headers so I didn’t catch onto the fact that you were trying to do that. :-p

If you find a solution, I would love to hear about it. I can’t even count how many hours I spent trying to get BCC working!