Mail has stopped sending

Hello,
I have an iPhone 4 running iOS 5.1. I use an IMAP account to send and receive email. It's been running perfect for over a year.
Then yesterday, and for no reason, mail stopped sending and goes straight into the outbox after this error message:
"A copy has been placed in your Outbox. Sending the message content to the server failed".
The thing is I haven't changed any mail account preferences, SMTP, Passwords or anything. Furthermore the exact same mail account settings on my MacBook Pro work just fine. I can send and receive perfectly.
Anybody have any clues?
Thanks,
Mike

Thanks again ckuan.
My outgoing mail server is the same. Password is the same.
Problem still here this morning. Every time I send an email it won't send. Gets sent (with error message above) straight into the outbox.
Just to note. I can recieve email into this account fine.
I contacted my service provider to check all setting are correct. They are.
I'm totally at a loss as to:
A) Why it just suddenly stopped working despite me not changeing any mail account settings
B) What I can do to fix it. My iPhone is no use unless I can send business emails

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