Postfix: no local interface found for ::1

The following error can been seen in logs after disabling IPv6:

May 30 19:04:58 master postfix[16588]: fatal: parameter inet_interfaces: no local interface found for ::1

This prevents postfix from starting, to fix it use the following command:

sed -i 's/^inet_protocols = all/inet_protocols = ipv4/g' /etc/postfix/main.cf 

Start postfix :) :

service postfix start