Josh,
Just for the record... I received the email
Maybe when we get it working... you could share with us how you sent the index page? Looked good.
As you know, I have been dealing with this issue lately, too. I finally exported my User table to excel, the stripped out only what I needed and will use that in my bulk mail program.
I talked to a friend who runs a fourm with vbullitin and it seems that their mass mail option may be something to look at in developing the UBBT option. My undertsnading is they have MANY option on who to send to... and funny, they do it in groups of 200 to eliminate the time out possibilty. After the 200 are sent it just prompts to click and continue.