While you have been away we have gotten the Language= NOTHML and very
lately the Attachment= keyword but both those apply to attachments of
various sort, not to the actual content of the items.  Far as I know the
only way to screen for objectinable content is a human does it.

Generally, the objectionable material you mention comes from  "outside"
and making your list "semi-moderated" with defualt of REVIEW for new
subsriptions will block much of it.  A 'semi-moderated' list is one
where the subscribers, by being subscribers, approve their own postings,
anything else goes to the editor for appproval.

* Send= Editor
* Editor= [log in to unmask], (listname)

The name of the list must be in paraentheses and the address of the
editor must be specified, can't use OWNER.  Can have more than one
specific editor but items in question will be sent for approval only
to the first one listed.

The subscription option of REVIEW comes in where people 'sub to spam.' All
postings from new subscribers must be approved by editor, until the new
sub is set NOREVIEW.  Clearly all this puts an extra load on the listowner
and you will have to judge whether it is worthwile or not.

As to a "content" filter, such as the Filter= keyword for addresses,
I am not aware of it, other than the default stuff looking for spam, which
will catch some but by no means all such things (I think it looks mostly
at the headers but can't swear to that).  I don't think there is a
Content= type keyword such as you ask about, but I have been wrong often
on many things.    Douglas