blocking emails with sendmail 1

[SM777]

How can I block a certain email address from reaching my mailbox?

I either want the sender to get a bounce back saying my email address doesnt exist (for any email that the sender sends to me), or just delete it without any notification for either sender or recipient.

 

[RhythmAce]

First add this to /etc/mail/sendmail.mc if it's not there.
FEATURE(`access_db')
then do this:
m4 /etc/mail/sendmail.mc > /etc/sendmail.cf

now you need to add something like this to /etc/mail/access :

spammer@aol.com REJECT
cyberspammer.com REJECT
192.168.212 REJECT

Note that you can use an address, domain or ip. Next create access.db with the following command:
makemap hash /etc/mail/access < /etc/mail/access

You should be all set. Don't forget to restart sendmail so it reads sendmail.cf