Subj : Added RBL lookups on connection via DroneDL.
To   : GitLab note in main/sbbs
From : Rob Swindell
Date : Fri Jul 07 2023 16:13:24

https://gitlab.synchro.net/main/sbbs/-/merge_requests/297#note_3655

So here (and later) `checkip()` is returning `false`, but the code that checks the return value of `checkip()` only checks for 'NXDOMAIN' and `undefined` as handles those as expected return values.
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