[Mailman-Users] Not sending to list members

[certuspersonality]

I have sent a email message to an email list of which I am the 
administrator and also on the member list, received the email 
requesting approval for publication, gave that approval, and then the 
email message was sent to me (info at certuspersonality.com) as the 
original supplier of the message, the number of times that equals the 
number of members in the email list. It did not go to the list 
members (except for me).

Which setting do I probably have wrong in Mailman?

Help greatly appreciated,
Herward Hencke