I'm looking at extending a few of the DNS functions for things I want to 
check on incoming connections and mails, and I was wondering if there's any 
particular reason that NS and MX records were the only things cached 
locally by Xmail? Specifically I was thinking about A and PTR records - was 
there some particular reason for not caching those results (too many, 
typically low TTL, something else)? Or did it just burden the file system 
too much? Or something else?

I'd rather avoid the round trip time for DNS queries if I can, but if 
there's some overriding reason here, I'll just go straight to the wire for 
A and PTR queries....

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