Hello, The gmail smtp server is now refusing mails from my system when IPv6 is used, as shown in the log below:
Aug 20 06:25:08 petole postfix/smtp[27705]: Trusted TLS connection established to gmail-smtp-in.l.google.com[2a00:1450:400c:c03::1b]:25: TLSv1.2 with cipher ECDHE-RSA-RC4-SHA (128/128 bits) Aug 20 06:25:09 petole postfix/smtp[27705]: 9E2994012F: to=<nicolas.kowal...@gmail.com>, relay=gmail-smtp-in.l.google.com[2a00:1450:400c:c03::1b]:25, delay=1.7, delays=0.17/0.1/0.78/0.64, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[2a00:1450:400c:c03::1b] said: 550-5.7.1 [2a01:e35:8ae7:65f0::2 16] The sender does not meet basic ipv6 550-5.7.1 sending guidelines of authentication and rdns resolution of sending 550-5.7.1 ip. Please review 550 5.7.1 https://support.google.com/mail/answer/81126for more information. l8si5663122wiv.72 - gsmtp (in reply to end of DATA command)) I am not able to have an IPv6 rDNS record with my ISP, only an IPv4 one. I guess this is why it works when using IPv4 (tested by forcing inet_protocols = ipv4), and does not work any more with IPv6. Is it possible to have outgoing mail to gmail (or another domain) sent using my IPv4 interface? Thanks, -- Nicolas
