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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?

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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.

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  • Oke, the reference is pretty clear, thanks! I guess de IP I've got is an IPv6 than?
    – Tim Baas
    Sep 12, 2012 at 12:04
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    I dont know about your ip address whether it is ipv4 or ipv6.The syntax for both is given in my link i sent you.you can check whether your ip is ipv4 or ipv6 at:-ip-lookup.net
    – achal tomar
    Sep 12, 2012 at 12:25
  • Got it, it's IPv6.. I got it to work, thanks!
    – Tim Baas
    Sep 12, 2012 at 12:58
  • you are welcome!
    – achal tomar
    Sep 12, 2012 at 14:25

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