telnet retrobbs.sinclair.homepc.it
Worked for me yesterday, and today.
Must be something temporary.
It's working for me.
Mystic BBS v1.12 A31 for Linux Node 1
Copyright (C) 1997-2016 By James Coyle
Detecting terminal emulation: ANSI detected.
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Welcome to the Sinclair Retro BBS
--- Mystic BBS v1.12 A30 (Windows)
* Origin: Mystic.dynu.net 2310 (1:275/201)