I always don't know enough about DNS. This is great stuff.

If exe.dev is running their own DNS zone, then wouldn't they be setting the expiry value in the SOA record themselves? So they could set it to something short, and secondary servers are supposed to honor it, right?

> wouldn't they be setting the expiry value in the SOA record themselves?

If they thought about it. But it is something that even people relatively experienced in DNS matters forget about until it bites them and they've spent ages diagnosing the initially odd looking problems caused.