Strange Outlook 2007 mail did not arrive

[Martin Schweizer]

Hello

I have a strange issue. My setup is FreeBSD 7.2 amd64 and the newest
Cyrus Imapd (.15).:
In the maillog from sendmail I see  that the mail will transfered to
Cyrus but it never arrived in the addressed mailbox (of course I tried
different addresses...). I find out that, if I re-send a specific mail
the mail did not arrived but if I write the mail new (same text and
subject) it arrived. The only difference I find, was the message id
field in the header.

(sorry for wrapping the lines)

The bad one:
msgid=<!&!AAAAAAAAAAAYAAAAAAAAAHLJOa0CLtBIlvvDvgZBml3CgAAAEAAAAO+MSX+TYT9LnyICYgHv254BAAAAAA==@abc.c>

The good one:
msgid=<000401ca56ea$6babfd10$4303f730$@ch>

Any ideas are welcome.

Kind regards,
-- 
Martin Schweizer
schweizer.martin at gmail.com
Tel.: +41 32 512 48 54 (VoIP)
Fax: +1 619 3300587