Yes I think only text/plain, text/html and also message/rfc822(and sub text parts) should be allowed. Because attachments if any can be posted in form of links.
I am asking to allow text/html because Yahoo/Hotmail/MSOE, the most used e-mail clients offer rich text compose feature, and its tendency of people to use it, and probably its on by default and non-technical/newbie sender may not know how to disable it. OR if we block text/html then he/she should automatically informed(atleast 1 or 2 times) that his/her message was blocked, for it is not text/plain. But I dont know if that can be done with mailman.
Amish.
Philip S Tellis wrote: Should we block non-text messages on this list? State your opinion.