SPF is a decent tool, however it always surprises me when banks open
their SPF records to the point where they are at risk. In just the last
couple of days, we see a couple of banks adding to their SPF records,
'all IP(s) in our cloud providers network /16'.
Now, (in the latest case most of MicroSoft's Azure) maybe that is what
they are recommended to do, however anyone else using those IP(s) is now
in a perfect position to take advantage of this..
:(
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