Blacklist. Technical details (ISPmanager)
From ISPWiki
Sendmail и Postfix
A Blacklist for Postfix and Sendmail is based on the content of /etc/mail/access. For example:
12.34.56 REJECT spamer@spam.com 550 Spam now allowed here somedomain.ru 550 Access is temporary blocked for your domain
The REJECT record denies email using a standard denial message. Error code 550 will be shown.
Exim
A Blacklist for Exim is based on the content of /etc/exim4/blacklist. For example:
10.10.10.10 spamer@spam.com somedomain.ru
i.e. a list of random email addresses.
