====== Autentizace smerem ven (ie. ke smarthostu) ======


This document describes 5 easy steps to setup your Postfix email server as smarthost to relay on DNS Exit mail relay server for all email sending.
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The mail relay service from dnsExit.com can be found at here

1. Create password maps file (it assigns username/passwords to specified mail servers). You can choose any name, let's say it is /etc/postfix/relay_passwd. It's content should be as follows:    
 
 relay.dnsexit.com USERNAME:PASSWORD 
     
 Note: Replace USERNAME and PASSWORD with your DNS EXIT mail relay username and PASSWORD.   
   

2. Set proper permissions for that file:    
# chown root:root /etc/postfix/relay_passwd  
# chmod 600 /etc/postfix/relay_passwd     
 

3. Create hash from maps file (remember to do it each time you change your maps file):   
#  postmap /etc/postfix/relay_passwd   
    


4. Configure your /etc/postfix/main.cf:    
relayhost = [relay.dnsexit.com]  
smtp_sasl_auth_enable = yes  
smtp_sasl_password_maps = hash:/etc/postfix/relay_passwd  
smtp_sasl_security_options =    

Note: If your ISP blocks outgoing port 25. You can choose to use alternative SMTP ports by appending the port at the end:
relayhost = [relay.dnsexit.com]:26


5. Reload or restart your postfix:  
# /etc/init.d/postfix restart
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