The mailing list for listmasters using Sympa

[Russ Kepler <address@concealed>]

I am preparing to move a few mailing lists to sympa, and there are a couple 
of capabilities in majordomo that I'd like to continue in the sympa managed 
lists.  

The first is the ability to block messages containing specified strings in 
the header or body - this was particularly nice to block messages with 
encoded attachments and messages in all html, a very nice thing to do for an 
'only text' mailing list.  I would really like something that would filter 
out non-plaintext parts of a message and bounce it if there's nothing left, 
but would settle for a simply block.

The second was the ability to block users and domains from subscribing to a 
list.  It's of less use than it used to be (what with the number of ways to 
create new mailing addresses) but still useful.  I can't recall having run 
into this but as bad as my memory is I am sure that it's in sympa somewhere...

Thanks in advance for any replies.