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    Tutorial -0.001 SPF_HELO_NONE SPF: HELO does not publish an SPF Record

    Checking HELO/EHLO names is recommended by the SPF RFC. Publishing records for these hostnames is an important part of the SPF protocol. HELO/EHLO is used when Mail from is <> even if a receiver does not do 100% HELO checking. Publishing a HELO/EHLO rule involves creating an SPF record linked...
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    • dns dns record email rdns spf tutorial
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