When sending mails to Gmail I get this error
Received-SPF: fail (google.com: domain of [email protected] does not designate 2a01:4f8:xxx::2 as permitted sender) client-ip=2a01:4f8:xxx::2;
When I test the IPv6 2a01:4f8:xxx::2
reverse DNS (https://network-tools.webwiz.net/reverse-dns.htm) it maps to the correct host smtp.domain.com
SPF record
v=spf1 a mx -all
DNS records
- A record
smtp
targeting the IPv488.133.xxx.xxx
- MX record targeting
smtp