[CalendarServer-users] Can we use minus addressing instead of plus addressing with iMIP ?

Hello, My mail server does not support plus addressing but it does support minus addressing. Eg. abuse+6f5d8566-87e8-4a26-87b0-6e545fcf7f3d@darwin.int - This does not work. But, abuse-6f5d8566-87e8-4a26-87b0-6e545fcf7f3d@darwin.int This works - i.e mail is delivered to the abuse@darwin.int account. Is there any configuration in dcs to tell it to use the '-' character instead of '+' ? Thanks in advance, Amol