The mailing list for listmasters using Sympa

["Tech" <address@concealed>]

Hello
    I am wondering if someone can explain if it is possible to have sympa
only accept a outgoing message from the web interface only . not allowing
and mailed in messages .so that the user has to log in to send a message out
to the other subscribers?
    Reason we have had a few malicious folks use the mail in method to pass
things through that should not go through.
    Also has anyone fond a opensourse virus detection program that does work
with sympa
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