I would like to know if it is possible to do the following with sendmail (if so, how):
a) Limit (read bounce) a message if a user sends an e-mail with more than x cc's or bcc's for a message being sent via the server.
b) Limit the amount of messages/size of total messages sent per x period
c) Limit size of messages being received
If not by sendmail, is there anything else that can do that?
I'm just looking for something to have more controll over the use of my server by users, ie, make it easier(automated) to prevent abuse.