I know the setup is simple but for some reason its not working on my systems. I can send email to external locations and its sent without a problem but the source address is coming up as email@example.com instead of firstname.lastname@example.org. I am running centos 4 with postfix 2.2.10. I have set up the following in main.cf: myhostname = host.mydomain.com mydomain = mydomain.com myorigin = $myhostname masquerade_domains = $mydomain Has anyone else ran into this same problem or does anyone have any suggestions? TIA!!