This post is applicable in the Cloud database's Windows App as well as in the Legacy database.
Does your e-mail use a comma or a semi-colon to separate addresses?
You can select which to use when copying e-mail addresses from the Clubber or Leader grid or when using the Gather E-mail Addresses utility (under the Tools menu). This preference is set for each user account.
Go to Admin > Users.
Open a user record.
Set the selection for "Email Separator" to Semicolon or Comma.
Save and Close the record.
[Note: this feature was added at the request of a user who runs AWdB in a virtual windows environment on a Mac and needed the comma separator instead of the semicolon. Thank you!]