Can't send mail due to "One of the recipient addresses was incorrect" error

I have my iPhone set up with two mail accounts: my personal Yahoo account and my work e-mail account ([email protected], for example). I can send/receive email fine with my personal account, but for my work account, I cannot send any mail to any email addresses that are not people at my work with the same domain name (I can send to [email protected], but not [email protected]).
I thought the problem had to be with my settings, but I compared my settings on the iPhone with how I have my work email set up in Thunderbird and even Apple Mail. They're the same! So I'm at a loss. Any ideas?
Thanks!!

More than likely, yes, but since a MobileMe account is accessed as an IMAP account, when accessing the account with an email client you have the option to store messages on the server or locally on the hard drive or device. If your account has been compromised and someone is accessing the account with an email client on their computer, they could choose not to store the sent messages on the server so you wouldn't see them.

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