Can I prevent postfix from sending to specific email addresses using the check_recipient_access postfix option?

I tried to block some email addresses from spammers, but this setup doesn't seem to have any effect: smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/bad_recipients, permit_sasl_authenticated, permit_mynetworks, ... The emails are still forwarded. Here is an example of the bad_recipients file I have: # When updating, make sure to run this command once: # postmap hash:/etc/postfix/bad_recipients spammer@example.com REJECT When I do a mail to that email address, it still gets forwarded. alexis $ mail -s "Verify block" spammer@example.com Cc: Not much of interest here. ^D When I look at the logs I see something like this: > Mar 5 20:02:37 do postfix/smtp: E827740ADA: to=, > relay=mail.example.com[10.0.0.13]:25, delay=2.3, delays=0.03/0.01/1.8/0.41, > dsn=5.7.1, status=bounced (host mail.example.com[10.0.0.13] said: 550 5.7.1 > No such user! (in reply to RCPT TO command)) _Note: I edited the domain name and IP address._ The relaying to the external source clearly shows that my smtpd_recipient_restrictions settings did not block anything. I'm thinking that either it only accepts domains (although I think [the doc examples here](http://www.postfix.org/RESTRICTION_CLASS_README.html) say otherwise) or I have something else that tells postfix to ignore my list of recipient restrictions. Do you know how to make this feature work?