... but I noticed the domains that we were seeing this with did not have any
SPF records in place.  So when I saw this sudden increase come through, I
added a strict SPF policy for that domain.  The backscatter for that domain
all but stopped.  ... 

 

Good thing to check... the latest domain to get hit did NOT have an SPF
record (and this seems to have been the worst so far)... BUT MOST of the
ones that did get hit - did have an SPF record and we still get backscatter.

 

We typically add SPF on all domains.. but in reviewing we had missed a
couple of them.

 

Hopefully the Filter that David is referring to will help.



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