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A college of my has struggled days with this issue, gmail wouldn't accept any mail send from a IPv6, ended up disabling IPv6 at the end. It seems like google on
by cornedor 10y ago
A college of my has struggled days with this issue, gmail wouldn't accept any mail send from a IPv6, ended up disabling IPv6 at the end. It seems like google only uses IPv6 for internal mail's, sending a mail to another account sends them using IPv4. Even Facebook, Microsoft etc still use IPv4 for their email's.
- dingaling 10y agoGoogle do of course use IPv6 externally, but require rDNS for all inbound IPv6 SMTP sessions. Without that set for your MTA's host they'll reject immediately.