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## Postfix: sender-dependent SASL authentication.md

      
        
          
            
              
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                failover88
                / Postfix: sender-dependent SASL authentication.md
            
            
              Created
              November 4, 2016 10:52
                — forked from zmwangx/Postfix: sender-dependent SASL authentication.md
            
              
                Postfix: sender-dependent SASL authentication — relay to multiple SMTP hosts, or relay to the same host but authenticate as different users (e.g., two Gmail accounts)
              
          
        
      
        
  
      
    This is a sequel to "Postfix: relay to authenticated SMTP".
I would like to send mail from two different Gmail accounts using Postfix. Here is the relevant section in the Postfix documentation: Configuring Sender-Dependent SASL authentication.
As a concrete example, here's how to set up two Gmail accounts (only relevant sections of the config files are listed below):
/etc/postfix/main.cf:
    # sender-dependent sasl authentication
    smtp_sender_dependent_authentication = yes

sender_dependent_relayhost_maps = hash:/etc/postfix/sender_relay