content filtering with MailScanner 4.44 + postfix 2.1.5 on FC3

[ankush grover]

hey friends,

 I am using MailScanner 4.44 with postfix 2.1.5 on FC3. I want to do
some kind of content filtering

a) Banning  receiving & sending attachments for some users for example
       "ankush at example.com" is not allowed to send or receive any attachments.

b) Banning receiving emails for some users from the all other domains
except from
    one domain  for example if there is any email for user
"tom at example.com" from
    any other domain that mail should be dropped but this user should
be able to
    receive mail from the example.com domain but not from anyother domain.

c) People are still sending mails to the accounts of the ex employees
I want to
    totally ban mails to those accounts both within the organisation and from
    outside  means if the mail is for the user   "john at example.com"  that mail
    should get dropped.


If anyone can give me examples for the above 3 problems of mine that
will be very good and I will be very grateful to that person.


Please let me know if you need any further inputs.

Thanks & Regards

Ankush Grover