Hello,

for the soa record, i.e,
google.com. 43199 IN SOA ns1.google.com. dns-admin.google.com. 2012113000 7200 1800 1209600 300

Though I know dns-admin.google.com is an email address standing for dns-ad...@google.com

I have the questions that:

#1 what purpose is this address used for?
#2 if the admin email is foo....@gmail.com, then it express as foo.bar.gmail.com. Thus how to differ it's f...@bar.gmail.com or foo....@gmail.com?

Thanks.
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