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4

If TXT record contains an SPF record then it definitely can break mail delivery.


3

A Google search for bind dnssec returns a lot of relevant results. Two that look particularly promising are: https://www.isc.org/dnssec/ which then leads to https://downloads.isc.org/isc/dnssec-guide/dnssec-guide.pdf https://wiki.debian.org/DNSSEC%20Howto%20for%20BIND%209.9+ And for a broader explanation of DNSSEC, not specifically related to bind: ...


2

The reverse lookup zone is managed by the entity that manages that particular netblock, which almost certainly isn't you.


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