Email

1. 01

   Vim / Neovim

   Yank the ciphertext below into a buffer, then hit g?? on the line (or select it and press g?) to apply the built-in ROT13.

   ouhtbqri@tznvy.pbz

2. 02

   JS / TS

   The address is plain base64. Nothing clever, just a round trip.

   // Any browser console, or a Node REPL:
   atob('Ymh1Z29kZXZAZ21haWwuY29t')
   
   // Node, if you'd rather not lean on a DOM global:
   Buffer.from('Ymh1Z29kZXZAZ21haWwuY29t', 'base64').toString('utf8')

3. 03

   Haskell

   Same ROT13 as the Vim trick, spelled out. Drop it in a file andrunghc it, or paste the rot13 body into ghci.

   import Data.Char (chr, isAlpha, isUpper, ord)
   
   rot13 :: String -> String
   rot13 = map shift
     where
       shift c
         | isAlpha c = chr (base + (ord c - base + 13) `mod` 26)
         | otherwise = c
         where
           base = ord (if isUpper c then 'A' else 'a')
   
   main :: IO ()
   main = putStrLn (rot13 "ouhtbqri@tznvy.pbz")

If none of that appeals, I'm also on GitHub. An issue or a discussion reaches me just as well.