If you see
host aspmx.l.google.com[2607:f8b0:400d:c02::1b] said:
550-5.7.1 [2607:5300:101::79e] 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. Please review 550-5.7.1
https://support.google.com/mail/?p=i…tication_error for more 550
5.7.1 information. h1si3408978qew.71 – gsmtp (in reply to end of DATA
the destination dropped your connection due to (incomplete) IPv6-settings.
In this case one of theses checks failed:
Your hostname need a IPv6 recrd (AAAA) in your bind-zone that points to the IPv6 address of your server.
Your IPv6 address must have a reverse dns record that points back to the hostname.
If you can´t fix both settings, you can send to google over IPv4 only.
Disabled IPv6 completely in postfix is quite simple. Just set
main.cf and restart postfix.
AFAIK only google uses such a strict restriction. You can use IPv6 to connect other mail-server. In this case just set the protocol for google to IPv4 as described in send mail with postfix for certain domains using ipv4 or ipv6 only
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