for G Suite / for Office 365
What characters can I set for "Mail Groups"?
The following characters can be used.
-_.+ a-z 0-9 @
*They are not case-sensitive.
Capital letters and lower cases are identified as the same characters.
*If you want to use characters other than the above ones, you can set them in "Rule Groups".
If you have any questions, please feel free to contact Customer Success Guide.