Postfix Block Domains
To block Emails to/from specific domains, start by creating the access list file (e.g. /etc/postfix/access):
$ nano /etc/postfix/access
In there, add domain names followed by the action (DISCARD or REJECT). We recommend DISCARD:
spamdomain01.com DISCARD
spamdomain02.com REJECT
Tell postfix to use that file. Edit mail.cf and add/update smtpd_sender_restrictions header:
$ nano /etc/postfix/main.cf
smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/access
After you finish, postmat the file to prepare postfix to use it (every time you modify the file).
$ postmap /etc/postfix/access
Restart Postfix.Edited by peturbg