Add <ip1>, <ip2>, <ip3> placeholders to DNS template
Mail server on windows sends email from specific IP
It's required to setup SPF record in DNS template to include all server public IP addresses.
If mail server outgoing IP and public IP is changed in the future, the DNS will update the new IP automatically for all domains.
Example: "v=spf1 ip4:<ip> ip4:<ip2> ip4:<ip3> ~all"