On 17 May 2017, at 16:49, Michael Peddemors wrote:
It looks not bad, successive lookups to 3 parts.. and they all look
good. Don't like this part of course.. include:sharepointonline.com
ip4:52.104.0.0/14
Right there!
I've had thoughts about actually penalizing sites that list such vast
amounts of IP space in their SPF records or perhaps just ignoring those
large ranges in the SPF validation. I suppose it would be plagued with
false positives, but if enough people did it, it would give some
priority to actually think about your SMTP flows when setting up your
SPF records.
Best regards
-lem
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