Problems sending email to Gmail and Hotmail
 

I have the following problem
When I send email to Gmail returns the following:


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:

carolina.e.andia@gmail.com
SMTP error from remote mail server after end of data:
host gmail-smtp-in.l.google.com [2607:f8b0:4002:c09::1b]:
550-5.7.1 [2a02:4780:1:1::1:8130] Our system has detected that this
message does
550-5.7.1 not meet IPv6 sending guidelines regarding PTR records and
550-5.7.1 authentication. Please review
550-5.7.1
https://support.google.com/mail/?p=i...tication_error for more
550 5.7.1 information. e82si1900174ybh.213 - gsmtp

I have created the back in the IPV4 and IPV6 server

What could be the problem?

disable IPv6 or publish an SPF record