Quote:
Originally Posted by jhollington
The use of the question mark in "?all" at the end of this record tells receiving servers that the SPF record is actually "neutral," which means it really doesn't technically have any effect on receiving servers (or at least it shouldn't), so it technically renders the SPF record meaningless for all practical purposes.
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Even within the original concept of SPF it wasn't meaningless , but SPF is now much more about authentication and much less about policy. The difference between -~? is increasingly less relevant than between pass and not-pass.