Hello, sorry for answering in English, but my French is not very good.
I have exactly the same problem with my server (that is also hosted with Amen). Since a few days, the headers of the messages I receive, also have the same line then yours. This started to happen after a general upgrade to several components of the server.
I think that it's a new component of qmail that is doing this, but I'm still not sure. I send you the versions I currently have on my server. Please, compare with yours and maybe together we can discover what is causing the problem.
psa 7.5.2-rh9.build75050128.10
httpd 2.0.40-21.11
bind 9.2.1-16
courier-imap 3.0.8-rh9.build75050128.10
frontpage 5.0.2.2634
mailman 2.1.1-5
mysql 3.23.58-1.9
postgresql-server 7.3.4-3.rhl9
webalizer 2.01_10-11
php 4.3.8-art.rh9.3
mod_python 3.0.1-4
coldfusion Component was not installed
psa-migration-manager Component was not installed
SSHTerm 0.2.2-rh9.build75050128.10
spamassassin Component was not installed
psa-qmail 1.03-rh9.build75050128.10
psa-qmail-rblsmtpd 0.70-rh9.build75050128.10
psa-proftpd 1.2.10-rh9.build75050128.10
psa-logrotate 3.7-rh9.build75050128.10
psa-spamassassin Component was not installed
tomcat4 4.1.24-full.2jpp
psa-tomcat-configurator 7.5.2-rh9.build75050128.10
mod_perl 1.99_07-5
perl-Apache-ASP 2.57-rh9.build75050128.10
drweb Component was not installed
drweb-qmail Component was not installed
psa-bu 7.5.2-rh9.build75050128.10
psa-api-rpc 7.5.2-rh9.build75050128.10
If you have any news, please let me know. I'll also inform you if I discover a solution in the meantime.
Best greetings.
