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postfix_config_for_outgoing_smarthost [26.12.2017 11:54] (current)
Pascal Suter created
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 +====== postfix config for outgoing smarthost with TLS authentication ======
 +this is a short how-to, to get your postfix mailserver to send outgoing mail via a smarthost that requires TLS authenticatin: ​
 +
 +create a password file with the following contents: ​
 +  echo "​mail.server.com username:​password"​ > /​etc/​postfix/​smarthost_password
 +  chmod 600 /​etc/​postfix/​smarthost_password
 +  postmap /​etc/​postfix/​smarthost_password
 +edit main.cf ​
 +  nano /​etc/​postfix/​main.cf
 +and add / modify these lines: ​
 +<​code>​
 +relayhost = mail.w3design.ch:​587
 +smtp_use_tls=yes
 +smtp_sasl_auth_enable = yes
 +smtp_sasl_password_maps = hash:/​etc/​postfix/​smarthost_password
 +smtp_sasl_security_options = noanonymous
 +smtp_tls_security_level = encrypt
 +</​code>​
 +also make sure you're not creating an open realy server for everybody to use. for example limit your accetpable mail networks to localhost only is a good starting point (in main.cf as well): ​
 +  mynetworks = 127.0.0.0/8 [::​ffff:​127.0.0.0]/​104 [::1]/128
 +now check your neew config and reload it: 
 +  postfix check 
 +  postfix reload ​
 +montior your mail logs and send a test message to see what happens: ​
 +  tail -f /​var/​log/​mail.* ​
 +in another terminal: ​
 +  echo "this is a test " | mail mail@psuter.ch -s test