El jue, 3 dic 2020 a las 16:37, Wietse Venema (<wie...@porcupine.org>) escribió:
> Sergio Belkin: > > smtp_address_preference = any > > inet_protocols = all > ... > > <apere...@another-example.com>: Host or domain name not found. Name > > service error for > > name=another-example.com.mail.protection.outlook.com type=AAAA: Host > > found but no data record of requested type > > </snip> > > > > AFAIK if DNS over IPv6 fails it tries over IPv4, doesn't it? > > Postfix will send A and AAAA queries, but it will report an error > only for the last query that it tried. You might fimnd more details > in the Postfix logging. > > So, the complete error message would be : > > "I made DNS queries with type A and AAAA for the name > another-example.com.mail.protection.outlook.com. All queries > failed. The last query that failed had type AAAA. The last error > was "name exists but there is no AAAA record". > > But we reall don't want to send THAT in an email bounce message. > > > I wonder if beyond this bouncing the smtp uses then IPv4 and sends the > > messages anyway. Please could you clarify this for me? > > All A and AAAA queries failed. > > Wietse > Thanks Wietse for your answer Is quite interesting that I find the following in logs: Dec 2 23:53:09 muteriver postfix/smtp[28063]: warning: no MX host for another-example.com has a valid address record And then: Dec 2 23:53:09 muteriver postfix/smtp[28063]: ED1CF1813C56F: to=< apere...@another-example.com>, relay=none, delay=5.9, delays=0.17/0/5.8/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=another-example.com.mail.protection.outlook.com type=AAAA: Host found but no data record of requested type) and finally: Dec 2 23:53:10 muteriver postfix/qmgr[1528]: ED1CF1813C56F: removed That last line led me to wonder if the message was finally sent... If I try to resolve another-example.com.mail.protection.outlook.com manually on the mail server works fine with IPv4. What do you think? Was the message never sent? If so, is there a way that postfix retries later if there is a temporary resolution? Thanks in advance! -- -- Sergio Belkin LPIC-2 Certified - http://www.lpi.org
