DNS: Why so many *._domainkey.example.com prefixes?
AJ ONeal (Home)
coolaj86 at gmail.com
Mon Nov 23 14:28:06 MST 2015
I've tried googling a little, but I don't know enough to figure out what my
query should be.
I notice that every time I set up mailgun or mandrill or whatever I always
have to set up domainkeys. That part makes sense - RSA, public/private, etc
- I get that.
Intuitively I would think there is a single standard for where to find SMTP
domain keys, say
But instead it seems like one of these prefixes get picked at random:
pic._domainkey.example.com (this one baffles me)
So I'm looking at my long list of domains and it appears that only those 5
variations occur, but I'm not seeing a pattern.
Why isn't there just one standard prefix?
How does that querying server know which to query?
Isn't _ an illegal character?
I'd love to be pointed to some reading material as well as some short and
sweet explanations if you have one on hand.
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