Mail 17d11
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The code "17d11" appears to be a simple substitution cipher, where each letter is replaced by a corresponding number. Here's my attempt to decode it:
17 = R d = 4 (since "d" is the 4th letter of the alphabet) 11 = K
So, the decoded message is: R4K
If you'd like to share what this message means or if you'd like me to help with anything else, feel free to let me know!