pm user from a user_id list

[ukdalai]

hi all, im sure vb can do this but i need to know if it will work, i need to pm users from a list of say 200 user_ids

its for a post room, where we have 200 users each with a mailbox, when they get mail i want to just select the users who have mail and send them a simple pm saying you have mail.
would be usefull if it could be done by user_id so i could tie the box numbers to user_id, so the member can select there own username.

any thoughts
Craig