Re: Gmail block my mail

Found the issue.
That server is a VPS over Scaleway.
They do not provide PTR support on IPv6 because at each reboot of the machine they assign a random IPv6 while IPv4 is fixed and only in that case you can edit the PTR.

Additional i've set the postfix "main.cf" with that and restart postfix :

inet_protocols=ipv4

For how have that issue and have correct PTR over IPv6 i found that additional for postfix :

# Gmail IPv6 retry:
smtp_reply_filter = pcre:/etc/postfix/smtp_reply_filter

# Convert Google Mail IPv6 complaint permanent error into a temporary error.
# This way Postfix will attempt to deliver this e-mail using another MX
# (via IPv4).
/^5(\d\d )5(.*. \S+ - gsmtp.*)/ 4${1}4$2