Invalid message recipients?

[yukoner]

Bringin' this back 'cause I still have one account that won't work.

When I am sending emails I usually get the error message "Invalid message recipients".

Then I go to another account and "send/receive" without sending anything; then back to the account where I want to send an email and it will work. (Yup, I have to to a connection on a different account to get the one I want to send the email)

I do have one account, however, that nothing works on...just won't send any emails; always gives the "Invalid message recipients" error message.

My initial question is, "Is it the server that is being asked to send the email that decides it is an "invalid message recipient" or is it the Treo 700wx itself?