I've installed miniBB in one of my sites, and everything is going well except... that one of the users has an email looking like firstname-.name@provider.com. And miniBB considers that "-." is a mistake (OK, it's an uncommon email, but it's like this, and this user is very important for that forum).
Thank you

The file you need to edit is bb_func_checkusr.php

Find expression:

"^[0-9a-z]+([._-][0-9a-z_]+)*_?@[0-9a-z]+([._-][0-9a-z]
+)*[.][0-9a-z]{ 2}[0-9A-Z]?[0-9A-Z]?$"

Try to set it like:

"^[0-9a-z.-]+@[0-9a-z]+([._-][0-9a-z]+)*[.][0-9a-z]{2}[0-9A-Z]?[0-9A-Z ]?$"

It works. Thank you very much.