> A more serious question is
> Q: does it mean that a forger can forge my personal email address and
> use my SEND=OWNER mailing list to distribute his/her junk mail ?

Absolutely.

> Is there a mechanism to prevent this ?

Yes,  Send= Owner, Confirm

Set this way your message will be sent back to your address for it to be
confirmed before going to your list. So if it is forged, it comes to you for
approval instead of going straight to your list.

--
John Lyon
L-Soft international, Inc.
http://www.lsoft.com