Add a no_send_list table for email addresses that should not be allowed to sign up to hassles.
Add some code to check the no send list when someone signs up an email address and return an error if the address is in the no send list.
Adding test for no send list.
Syntax fixes.
Use entities in string to be matched
Try shorter string
Merge branch 'master' into feature/no-send-list
Merge branch 'feature/no-send-list'