Translation(s): English - Русский

Domain Keys Identified Mail (DKIM) combines several existing antiphishing and antispam methods to improve the quality of the classification and identification of legitimate e-mail. Instead of the traditional IP-address, to determine the message sender DKIM adds a digital signature associated with the domain name of the organization.

dkim

Postfix and opendkim

Install the package: 

  apt-get install opendkim opendkim-tools

Add to the Postfix signature opendkim. For convenience, I keep all the settings in /etc/postfix/dkim/, you can choose a different directory. 

  mkdir /etc/postfix/dkim/

Generate a key for mail.example.com server 

  opendkim-genkey -D /etc/postfix/dkim/ -d example.com -s mail

resulting in the directory /etc/postfix/dkim/ 2 files : mail.private and mail.txt (private and public key, respectively). The key file is necessary to allow read access for the group, which employs OpenDKIM : 

  chgrp opendkim /etc/postfix/dkim/ *
  chmod g+r /etc/postfix/dkim/ *

See also

CategoryNetwork