TS3899 why can't i send emails when not on wifi eg 3g

When on wifi eamils send fine, as soon as I lose wifi emails won't send.
measage says unable to send email.copy in outbox. its rejected by server.
I phone 5 latest IOS 7

We are experiencing this exact same behavior. Our environment is Exchange 2007 on Windows Server 2008, Windows Server 2012 domain controllers, and iOS 7. WiFi works fine but messages get stuck in outbox when sent over cellular broadband (3G/4G). Was able to reproudce problem over both Verizon and AT&T. I called Apple and engineering said that "the problem has been reported by others" and that "the problem will be fixed in a future update". Such joy. Also the problem appears to be related to message size...for sure anything over 100KB will fail over cellular broadband. Not sure of the largest message that will go through...from what I've read somewhere in the 40KB to 100KB range is where it starts to get crabby. Hard to say exactly what the problem is. Only happens with Exchange. But wasn't a problem on iOS6. Weird that an email and/or attachment size matters between WiFi and mobile broadband when going from iOS 7 to Exchange 2007 (in our case).

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http://support.apple.com/kb/TS3899
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TS3899 why can't i send emails when not on wifi eg 3g

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