I just love how this site works. I screw with this thing for two days, post my question, and then solve it myself five minutes later.

I changed the target address to another account I had and found my e-mails in the spam folder. Apparently the previous target account wasn't going to let me know I was getting junk mail.

Anyway, I found the To: From: and Subject: all on the same line, so putting newline characters (\n) at the end of each datasend call fixed the problem.