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Originally Posted by Jacinto
Not sure whether or not you read this whole thread, but I wrote earlier that I had already added those two SPFs:
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I've been pointing why your assumption that "include:spf.messagingengine.com" would cover all outgoing servers is wrong and why you should have used "include:spfall.messagingengine.com" instead. Adding explicit IP ranges is just a workaround.
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It did do the trick, but who knows for how long.
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This is why you should be using the spfall version, it will adjust with any changes to IP ranges.
There hasn't actually been a change, the spfall TXT record is the same as it was a year ago.
I'm assuming here that the email was sent out through wforward1-smtp for the normal reasons. If this happened to non-forwarded email sent using a domain hosted at fastmail, you should tell support.