in /etc/postfix/main.cf, change: 1inet_interfaces = localhost to 1inet_interfaces = all And restart postfix accordingly.

vi /etc/postfix/main.cf remove the domain 1... 2... 3#mydestination = example.com, localhost.com, localhost 4mydestination = localhost 5... 6... Then restart postfix: 1/etc/init.d/postix restart See some further discussion in https://www.digitalocean.com/community/questions/why-won-t-postfix-deliver-mail-to-own-domain

1root@example~# postqueue -p 2Mail queue is empty

in /etc/postfix/main.cf, add: 1smtpd_tls_security_level = may 2smtp_tls_security_level = may 3smtp_tls_loglevel = 1 4smtpd_tls_loglevel = 1 Details from From http://blog.snapdragon.cc/2013/07/07/setting-postfix-to-encrypt-all-traffic-when-talking-to-other-mailservers/

1root@example~# postsuper -d ALL 2postsuper: Deleted: 7966 messages