Intended for future use with chatmail servers. Standard email ports may be
blocked on some networks, while the HTTPS port may be accessible.
This is a squashed commit of PR #255 by s0ph0s-dog.
people will either paste the records in their zone file. in that case, the
records will inherit "IN" from earlier records, and there will always be one
record. if anyone uses a different class, their smart enough to know they need
to add IN manually.
plenty of people will add their records through some clunky web interface of
their dns operator. they probably won't even have the choice to set the class,
it'll always be IN.