I have registered 4 domains in the id *** Email address is removed for privacy *** . Among them right now we will use 3 domains - pinaly.com,pinalywebsoft.com and mymarketdeal.com . All are related to our small company. We donot have any intention to do spamming. So as the admin if you will provide the option reset password of the users by the admin than it will be good for us to give all the users their separate id.And also that can be managed by the admin.