diff --git a/postfix/main.cf b/postfix/main.cf
index e160c35..dcde676 100644
--- a/postfix/main.cf
+++ b/postfix/main.cf
@@ -5,6 +5,7 @@ maillog_file = /var/log/mail.log
 # Text that follows the 220 code in the SMTP server's greeting banner.
 # You MUST specify $myhostname at the start due to an RFC requirement.
 smtpd_banner = $myhostname ESMTP $mail_name (Debian)
+myorigin = /etc/mailname
 
 # IP protocols to use: ipv4, ipv6, or all
 # (set this explicitly so `post-install upgrade-configuration' wont complain)