Validate email function settings help

Hi everyone,
I'm going crazy trying to set up emails to validate accounts on Mystic.
Does anyone know how to do this and can help me?

Thanks in advance.

.--[ Pino Convertino ]----------------.
| SysOp Altair Mini BBS               |
| altairminibbs.net                   |
`-------------------------------------'

... Help! I can't find the "ANY" key.