Blacklisting external email addresses

[openletter]

I made an unsupported guide for that:

How to create private blocklist

How to create private blocklist This will create a blocklist that will apply to sender from for all email received by the server: Create the rules list file: $ sudo nano /etc/postfix/sender_access Add to the file the desired action or actions: username@example.com DISCARD example.net DISCARD Note that the DISCARD option will recieve the mail to the server and silently delete it without delivering to any inboxes. This is generally preferable to the REJECT option which will send a messag…