Gmail message does not meet IPv6 sending guidelines
- Lucas
- October 14, 2017
In this post we’ll learn how to fix the problem in Gmail with sending emails via the IPv6 protocol. Our system has detected that this message does 550-5.7.1 not meet IPv6 sending guidelines regarding PTR records and 550-5.7.1 authentication. There are two solutions, one is to set up reverse DNS for the IPv6 in question,