Postfix, smarthost with SMTP AUTH

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1. make sure libsasl2-modules is installed: 

you@box:~$ sudo apt-get install libsasl2-modules

2. Create password maps file (it assigns username/passwords to specified mail servers). You can choose any name, let's say it is /etc/postfix/smarthost_passwd. It's content should be as follows: 

hostname.tld USERNAME:PASSWORD

Note: Replace USERNAME and PASSWORD with your mailbox username and password.


3. Set proper permissions for that file: 

you@box:~$ chown root:root /etc/postfix/smarthost_passwd  
you@box:~$ chmod 600 /etc/postfix/smarthost_passwd

4. Create hash from maps file (remember to do it each time you change your maps file): 

you@box:~$ postmap /etc/postfix/smarthost_passwd


5. Configure your /etc/postfix/main.cf: 

relayhost = [hostname.tld]  
smtp_sasl_auth_enable = yes  
smtp_sasl_password_maps = hash:/etc/postfix/smarthost_passwd  
smtp_sasl_security_options =    
smtp_use_tls = yes

Note: If your ISP blocks outgoing port 25, you can choose to use alternative SMTP ports by appending the port at the end: 

relayhost = [hostname.tld]:587

6. Reload or restart your postfix: 

you@box:~$ /etc/init.d/postfix restart
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