====== Postfix auf Debian ======

===== Befehle =====

<code>
mailq
less /var/log/mail.log
postsuper -d ALL
postsuper -d <ID>
systemctl restart postfix
</code>

===== Installation =====

<code>
apt update
apt install postfix
apt install postfix libsasl2-modules          # relay mit smtp auth
</code>

===== Konfiguration =====

==== Sender Mapping ====
''/etc/postfix/main.cf''
<code>
sender_canonical_maps = hash:/etc/postfix/sender_canonical
</code>

''/etc/postfix/sender_canonical''
<code>
root    root@host.example.org
</code>

<code>
chmod 600 /etc/postfix/sender_canonical
postmap /etc/postfix/sender_canonical
</code>

==== Smarthost ====

If not already installed:
<code>
apt install libsasl2-modules
</code>

''/etc/postfix/main.cf''
<code>
relayhost = [smtp.example.com]:587
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/relay_pass
smtp_sasl_security_options = noanonymous
smtp_use_tls=yes
smtp_tls_security_level = encrypt
</code>

''/etc/postfix/relay_pass''
<code>
[smtp.example.com]:587 user@example.com:password
</code>

<code>
chmod 600 /etc/postfix/relay_pass
postmap /etc/postfix/relay_pass
</code>

===== Test =====

<code>
apt install mailutils
</code>

<code>
echo "Test" | mail -s "Test mx01" test@example.com
</code>

<code>
openssl s_client -connect mx01.example.org:587 -starttls smtp
</code>