Subj : Added RBL lookups on connection via DroneDL.
To   : GitLab note in main/sbbs
From : Rob Swindell
Date : Fri Jul 07 2023 04:10 pm

https://gitlab.synchro.net/main/sbbs/-/merge_requests/297#note_3654

Why 'NXDOMAIN' as a magic string to return and check for? `resove_ip()` returns `null` on failure to resolve, so just check for a non-truth result of `checkip()` and return the return value of `resolve_ip()` here.

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