I found an interesting document, describing how to use majordomo with postfix which I used to do what I want. (Actually, I didn't find anything to my problem. So I tried to set up majordomo... ;-)
http://www.csh.rit.edu/~jon/projects/majordomo/#postfix
That's what I did (ski is my login):
Create the mailbox where you would like to receive the mailing list into. I used my IMAP client and create a group called ml.test1
# mkdir /etc/postfix/mailing_list # mkdir /etc/postfix/mailing_list/ski # chown ski:ski /etc/postfix/mailing_list/ski
su - ski
cd /etc/postfix/mailing_list/ski vi aliases test1: /var/spool/imap/ski/.ml.test1/
/opt/postfix/sbin/postalias /etc/postfix/mailing_list/ski/aliases ^D
# vi /etc/postfix/main.cf alias_maps = dbm:/etc/aliases, dbm:/etc/postfix/mailing_list/ski/aliases
# /opt/postfix/sbin/postfix reload
Now, whenever a mail to user test1 arrives, the alias is read from the file /etc/postfix/mailing_list/ski/aliases. Because there is no user test1 the delivery is done as the owner of the alias file, ski in this case. ski can write to ski's Maildir, of course...
Sven