Run the following command:
dpkg-reconfigure postfix
Configure the settings as follows:
- General type of mail configuration?
Internet Site - System mail name:
example.com(not mail.example.com) - Root and postmaster mail recipient:
ubuntu(your user name) - Other destinations to accept mail for:
(to use default value) - Force synchronous updates on mail queue?
No - Local networks:
127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 - Mailbox size limit:
0 - Local address extension character:
+ - Internet protocols to use:
all
Category:
OpenLiteSpeed