Email filter

Hi,

I have following queries:-
A) How to set up a filter for all(_at_)mydomain(_dot_)com so that unsolicited 
emails
from outside do not land up. The originating email address should be from an
allowed  group/email account.
Other people sending emails to this address should be bounced
back with appropiate message.

B) How to restrict sender to send mail with attachments to a particular
account. Peolpe sending attachments should get their emails bounced with
appropiate message and guidance to contact their local support centre and
get a proper email address to send attachments to.

FYI: I am using Linux 6.1 with Sendmail 8.9.3 & Procmail as local delivery
agent.

Any help in this regard will be appreciated.

Thanks

jayanta

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