Restrictions on "MAIL FROM:"

[Ronny Haryanto]

On 07-Dec-1999, Sam wrote:
> Only true to a limited extent.  Most ISPs reject MAIL FROM:s that
> are clearly bogus, but that's about it.

Could anyone give me pointers on how I can enforce restrictions on
MAIL FROM: in SMTP sessions, for example the domain part must be
resolvable.

-- 
Ronny Haryanto