This is again related to the same header problem that's being experienced by some in gmail, and qmail-scanner.
All mail headers should only be terminated by a \n, not a \r\n.
See post:
http://lists.dorkzilla.org/archive/roundcube-dev/2005Nov/0889.html
This change should probably be added to CVS for all to use.
--
Dave Wood
Hello all,
my local amavisd-new reports a problem with the header of mails sent by
roundcube:
X-Amavis-Alert: BAD HEADER Improper use of control character (char 0D hex) in message header 'MIME-Version'
MIME-Version: 1.0\r\n ^
It's late and I'm tired, so I didn't check yet, what might cause this..
Balu