[NBLUG/talk] GMail and IPv6

[Omar Eljumaily]

We were talking about IPv6 a while back.  Out of the blue this morning 
Google started bouncing mail from my office.  It turns out that Google 
is now insisting on an IPv6 reverse lookup record.  My solution was to 
turn off IPv6 in Postfix.

  host aspmx.l.google.com[2607:f8b0:400e:c03::1b] said:
     550-5.7.1 [2601:645:1:f900:be5f:f4ff:feea:b1f1] 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=ipv6_authentication_error  for more 550
     5.7.1 information. gb7si2753489igd.12 - gsmtp (in reply to end of DATA
     command)