A lot of spammers use free email services to signup to services so sometimes it is good to ban these (Though probably not a good idea to ban the more popular ones such as Gmail).
To ban a free email domain service go to:
- Login your admin area
- Navigate to: Setup -> Other -> Banned Emails
- Click the “Add” tab located at the top of the table of banned domain names
- In the single field enter the domain name you would like to filter out, if you wanted to block out Gmail simply enter gmail.com
- Once you have inserted your banned email click “Add Banned Email”
You will have to ban each domain one by one, using Google you can find a long list of known email services where a lot of users are spam users.
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