There appears to be a soft cap on the number of email addrsses you can add to a mail group under Plesk for Windows. The number appears to be around eight addresses per mail group before the Plesk interface issues an error. This number of users is not a limitation of MailEnable as mail groups support at least fifty users. I would like to know if anyone has found a work-around to this before I open a support ticket with SW-Soft . It seems like a really low and arbitrary number to me.