I've been checking threads, but can't seem to find my answer. I have the Mail & AOL 3.2 programs and Web access on my Treo 600 (with T-Mob service). I can't seem to receive larger pictures by email on my Treo. Is there a limit to the size of the received message?

If I send to my phone's address, I get this message:
--- The message cannot be delivered to the following address. ---
xxxxxxxxxx@tmomail.net Permanent error involving remote host.
550 Message refused

And if I send to AOL, I get a paperclip icon but am unable to open it.

Any comments appreciated.
(Do I need to buy Snappermail?)