2 comments...
1) What about ip 66.139.75.100?
2) You've added a "-all" in the TXT record. That's a bit strict, but more to the point, an include record shouldn't add any type of "all" suffix, that's up to the domain owner who will be using the include record. I know I can't use the record since I don't exclusively use FM's smtp servers.
So maybe something like this instead?
"v=spf1 ip4:66.111.4.0/24 ip4:66.139.75.100"
That way my domain can have a txt record like:
"v=spf1 include:spf.messagingengine.com include:customer-spf.mxes.net include:gmail.com ~all"
...including Fastmail, Tuffmail, & Gmail and still keeping it slightly open in case one of my family members decides to use the ISP smtp server.
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