Incoming Mail Being rejected/bounced back

[ITDevil]

2008-01-20 11:03:37 1JGda4-0005fi-Oe <= username@mysunrise.ch H=mail-proxy-be-01.sunrise.ch (gw-out-be-03.be08.sunrise.ch) [194.158.229.48] P=esmtps X=TLSv1:AES256-SHA:256 S=1454 id=000701c85b86$65892090$309b61b0$@ch T="fdsf s" from <username@mysunrise.ch> for username@mailhost2.com
2008-01-20 11:03:37 1JGda4-0005fi-Oe ** username@server.mailhost.com <username@mailhost2.com> F=<username@mysunrise.ch> R=virtual_aliases:
2008-01-20 11:03:37 1JGda4-0005fi-Oe ** username@server.mailhost.com <username@mailhost2.com> F=<username@mysunrise.ch> R=virtual_aliases:
2008-01-20 11:03:37 1JGda5-0005fl-BX <= <> R=1JGda4-0005fi-Oe U=mail P=local S=2448 T="Mail delivery failed: returning message to sender" from <> for username@mysunrise.ch
2008-01-20 11:03:37 1JGda4-0005fi-Oe Completed
2008-01-20 11:03:40 1JGda5-0005fl-BX => username@mysunrise.ch F=<> R=lookuphost T=remote_smtp S=2516 H=mx.mysunrise.ch [194.158.229.68] C="250 2.0.0 m0KH3l8X014558 Message accepted for delivery"
2008-01-20 11:03:40 1JGda5-0005fl-BX Completed

any idea how to fix it ?

username is the DA master user



FIXED

[nobaloney]

First you'll have to ask the postmaster at the rejecting domain why they're rejecting it.

Jeff