When you block an unwanted email in your Optonline account, it is automatically deleted or sent to your spam folder. You do not receive notification of the deleted email and it never appears in your account's inbox. In addition to blocking emails from specific senders, you can block emails based on the sender's domain. The feature is free to use and is easily accessible. You can add and remove email addresses from the list at any time.
Access your Optonline account in a Web browser. Log into the account with your username and password.
Click "Preferences" in the upper-right of the screen to view management options for your email account.
Click "Blocked Sender List" and enter the email address you want to block in the appropriate field. Click "Add."
Click "Delete" or "Spam Folder" to indicate where you want the blocked emails placed.
Click "Save" to keep your new settings for the email account.
Access your list of blocked senders, click the sender's address and click “Remove” to allow emails from the sender again.
Add domains by entering the whole domain name in the blocked sender list. For instance, you can enter “yahoo.com.”