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1. Open the file /etc/postfix/main.cf and add/edit the following lines to look like the following:
   

   smtp_sasl_auth_enable = yes
   smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
   smtp_sasl_security_options =

2. Also in /etc/postfix/main.cf, edit the following:
   

   myhostname = <hostname-of-redcap-vm>
   

   #$mydomain (commented out - this will revert to the domain portion of myhostname if specified)

   myorigin = $mydomain

   inet_interfaces = loopback-only

   mydestination =

   relayhost = <SMTP-server>:<SMTP-port>

   
   

3. Reload Postfix with the new configuration:
   

   postfix reload

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