search for: sender_rewrite

...asl_auth_enable = yes smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/passwords # note that with no security options on, we're using sasl-plain installed above. smtp_sasl_security_options = # You might need this, you may not. #sender_canonical_maps = regexp:/etc/postfix/sender_rewrite #---------------------------- 5) Create file /etc/postfix/sender_rewrite. Note that not all Comcast customers need this, I didn't when I authenticated as above. Obviously, replace "USERNAME" with your user name. #---------------------------- /^([^@]*)@.*$/ USERNAME at comcast.net...