Hi,
I recently had some issues with sending emails with exim4 (mutt or mail commands) to gmail accounts. This is the error log I get when trying:
"This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
lorenzo.cozzi1@gmail.com
host gmail-smtp-in.l.google.com [2a00:1450:400c:c09::1b]
SMTP error from remote mail server after pipelined end of data:
550-5.7.1 [2001:760:2c05:1019:2d8:61ff:fe2e:adc3] Our system has detected that
550-5.7.1 this message does not meet IPv6 sending guidelines regarding PTR
550-5.7.1 records and authentication. Please review
550-5.7.1
https://support.google.com/mail/?p=IPv6AuthError for more information
550 5.7.1 . e8si26543251wrj.94 - gsmtp"
Someone knows how to fix it?
My computer has Debian testing installed with kernel 4.20.0-trunk-amd64.
Thanks in advance,
Lorenzo