in reply to
exchange in Net::DNS
I imagine it is the same or similar meaning as described in the related RFC
Then you're not looking real hard
See also Determine if domain is actually used for email, where monks even LINK to the related RFCs
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
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