Sending to Gmail via IPv6 gives me no troubles.
MX, host and helo all have their AAAA records. I figure it would not only be Gmail with problems if IPv6 MX had no reverse DNS. Greets, Ludi Von: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org> Im Auftrag von Thomas Gesendet: Montag, 1. März 2021 10:15 An: Postfix users <postfix-users@postfix.org> Betreff: Re: can't send to GSuite mailserver via IPv6 protocol Please see this description which is similar to mine: https://serverfault.com/questions/655250/gmail-bouncing-mail-sent-over-ipv6- ipv4-working And the answers look interesting. Regards.