Why is outgoing mail rejected by the Exchange server?

Hi all.
One in every 10 emails sent via Mavericks Mail is being rejected by my Exchange server. It's more like one in two emails with attachments. Shutting down Mail and re-opening doesn't help. Eventually I get the rejection window and list of servers: when I click the one I'm already trying to use, it sends! I'm presuming this is a bug, or something's changed in the way Mavericks Mail deals with Exchange because nothing else has been altered.
Yours,
Aidan

Hey Aidan!
You may want to try some of the troubleshooting steps listed in the following article in an attempt to resolve this issue:
OS X Mail: Troubleshooting sending and receiving email messages
http://support.apple.com/kb/ts3276
Thanks for using the Apple Support Communities!
Cheers,
Braden

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