Limit postfix to IPv4 for now.
Limit postfix to IPv4 for now.

This is to avoid email rejections like this:

«The sender does not meet basic ipv6 550-5.7.1 sending guidelines
 of authentication and rdns resolution of
sending 550-5.7.1 ip. Please review 550 5.7.1
https://support.google.com/mail/answer/81126for more information.»

holderdeord/hdo-puppet,holderdeord/hdo-puppet,holderdeord/hdo-puppet,holderdeord/hdo-puppet,holderdeord/hdo-puppet