Null MX doesn’t stop anyone from spoofing your domain to send email though.
Yes, I know, I wrote the RFC about it.
SPF, DMARC are tools that work together to protect your domain and your
reputation. If SPF was the magic bullet then nothing else would be needed.
The basic problem with SPF is that it can't describe all of the ways that
people send mail. But it says "I send no mail at all" just fine.
Regards,
John Levine, jo...@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly
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