Postfix

Description

What is Postfix? It is Wietse Venema's mail server that started life at IBM research as an alternative to the widely-used Sendmail program. Now at Google, Wietse continues to support Postfix.

Postfix attempts to be fast, easy to administer, and secure. The outside has a definite Sendmail-ish flavor, but the inside is completely different.

Setup as relay

Check log

$cat /var/log/mail.log     

Using command lines

Create a file

$nano /etc/postfix/sender_canonical

Edit (example)

$root@localmachine <tab> postmaster@domain.com
$root <tab> postmaster@domain.com

Create sender_canonical.db file

$postmap hash:/etc/postfix/sender_canonical

Add sender_canonical variable to /etc/postfix/main.cf

$postconf -e "sender_canonical_maps=hash:/etc/postfix/sender_canonical"

Restart Postfix

$systemctl restart postfix

IMPORTANT : In my enterprise the server is in DMZ, so i need to disable NAT when, DMZ > Trust.

Using webmin

General option

Set with webmin > server > postfix > General Options

Canonical mapping

Set with webmin > server > postfix > Canonical Mapping

Entry for “tables for sender addresses” : hash:/etc/postfix/sender_canonical

Date : 2017.06.12