BB8830, Sprint, BIS.
Our email domain host (Charter) recently began required authentication from our Outlook Express accounts in order for our office staff to be able to send emails. If I understand correctly, this means the Charter server checks our email id and password prior to accepting the email message we're sending to be sure it's coming from a legitimate account / user and not from a spam source.
Since that change, I can no longer send myself or anyone else in my office an email from my blackberry. I can send email to anybody else with no problems.
When I send myself an email, I get a message that says the email is undeliverable, authentication is required to send email as
I've talked to both Sprint and Charter tech support and, of course, they're pointing at each other and neither can offer me a solution.