In the headers of an email it says:
google.com: domain of transitioning @.nl does not designate ****:*::****::* as permitted sender
We need this mail to be spam-free.
I know we have to add this IP(?) to the DNS-records as a txt but what kind of IP is it, and what would the txt record look like?
Best Answer
You need to add proper SPF record in your DNS zone file for syntax of this record setup refer to:-openspf
The spf record is like:-"
v=spf1 mx -all" to allow domain's MX's to send mail for the domain and prohibit all others.