> I need a bulletproof POP3 mailbox that won't be shut down
> for spamming.
> My mailboxes keep getting shut down.

Hmmm... sounds like a problem with Yahoo's server.  They
have
some really great tech support if you e-mail abuse at yahoo.com
and tell them your name, address, phone number, etc.  Tell
them that you're having this problem and that you'd like a
special "premium" account that allows you to send unsolicted
e-mail to all corners of the world without getting shut
down.
 be very clear to them that you're sending UNSOLICITED
e-mail, They'll give y0u th3 h00kup.  :-)