Blocking a certain e-mail address?

Hi, this probably has been asked before ... but how do I block a certain e-mail address that keeps sending spam (always using the same address) on my mail server?
Preventing these mails to enter the mail queue would be optimal ... they seem to slow down the server enormously.
(I'm using a RBL).
Thanks a lot!

1. create a file /etc/postfix/bad_senders
2. edit the file and add the following:
[email protected] REJECT
3. save and issue:
sudo postmap /etc/postfix/bad_senders
4. edit /etc/postfix/main.cf and add
checksenderaccess hash:/etc/postfix/bad_senders
to:
smtpdsenderrestrictions
5. issue:
sudo postfix reload
See here for more info: http://www.postfix.org/spam.html
HTH,
Alex

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