Originally Posted by Artashes
That is why keeping the company forums locked is a good idea. Let only your customers register for an account. That can always be verified by the same email address used when signing up for service.
The things to consider is that when customers leave, what do you do? Do you still permit them to access the forum? Do you delete their account and posts? What if they left because they were unhappy with the service and come back from time to time to discourage others from signing up? What if they post a negative review? How do you deal with it?
when our forum was active what we did with ex clients was yes still allow them forum access, but any posts/comments they made had to be verified by admin/moderator before being published. If their comments were negative and just made to abuse/turn people away from us then they did not get published and if needed we would ban the user