This is the Postfix program at host mx3.messagingengine.com.

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# THIS IS A WARNING ONLY.  YOU DO NOT NEED TO RESEND YOUR MESSAGE. #
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Your message could not be delivered for 2.0 hours.
It will be retried until it is 1.0 days old.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

			The Postfix program

<ogrisel@emailuser.net>: connect to
    /var/imap/socket/lmtpprox[/var/imap/socket/lmtpprox]: Connection refused