The mailing list for listmasters using Sympa

["Thomas Barth" <address@concealed>]

Hi,
I simply want to send a newsletter to community-members
monthly. Sympa adds the following lines into the 
emailheader that are not necessary for the newsletter.

X-Loop:
X-Sequence:
Errors-To:
Precedence:
X-no-archive:
List-Id:
List-Help:
List-Subscribe:
List-Unsubscribe:
List-Post:
List-Owner:

The current state of my config is very simple,
but also tried the other template for news-
letter :

subject First example (an open list)

visibility noconceal

send public

review public

owner
email address@concealed

I am reading the whole documentation but don't 
understand all settings yet. What statement is 
used in Sympa to prevent the lines above?

Thomas B.