On 24 Jan 2020, at 3:33, Laura Atkins via mailop wrote:
Using +all is actually a giant, negative reputation hit according to
various folks I’ve talked to about filters. Using +all says “every
IP is valid” and this was (dunno about still is but definitely was)
used by spammers so they could have SPF validate bot spam.
I thought it interesting to scan for the relative frequency of each one
in the SPF records I've observed over the last 6 months...
expression | count
------------|----------
+all | 142150
all | 159293
?all | 5816058
-all | 18227533
~all | 28709709
This data comes from an ongoing analysis of ~190 million unique domain
name observations across legacy, new gTLDs and ccTLDs in that same
period.
Best regards
-lem
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