1

E-mail send from my own e-mail (example@domain.nl) to a Gmail-account is marked as spam. When I view the e-mail headers you will see a softfail. I have tried to set the SPF-record for my domain, but I keep getting a softfail:

Received-SPF: softfail (google.com: domain of transitioning example@domain.nl does not designate 2a02:348:83:cc40::1 as permitted sender) client-ip=2a02:348:83:cc40::1;

2a02:348:83:cc40::1 = 141.138.204.64

I have tried to set different SPF-records for the domainname: example.nl, an example:

v=spf1 ip4:141.138.204.64 ~all

What SPF-record to I need to set in order to 'pass' for the SPF?

1

After reading more on Serverfault I've found the answer here and I used the following SPF:

"v=spf1 a mx ip4:XX.XX.X.XX ip6:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX ~all"
0

You should update your spf to use the /64 network for performance, also be sure you have a valid PTR record and FCrDNS is configured for IPv4 and IPv6

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