Someone I know asked me what sort of bad things could happen if one
published a broken DMARC record. Obviously, if your record is bad people
won't follow your policies and you won't get your reports, but anything
else? Have you ever heard of MTAs burping on a bad DMARC record?
I've looked at the C OpenDMARC and perl Mail::DMARC libraries and they
both seem pretty sturdy: fetch a TXT record and if they find one, look
for
the tags they want and ignore everything else.
As an experiment, I added 32K of junk to the _dmarc.johnlevine.com TXT
record and as far as I can tell, it's made no difference. I still get the
same reports saying the same things. DNS libraries need to use TCP to
fetch it but they all seem able to do that.
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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