Whitelisting is useful when mail from a sender you do want to receive email from is being captured by the spam filter, Block-listing is useful when unwanted mail from a sender is still getting through to your inbox.

1. Log in to the spam filter through your webmail (SpamTitan option on the top right-hand corner)
2. Click Filter Rules
3. Click on User Block-list or User Whitelist.

In addition to block-listing or whitelisting a sender, you can also block-list or whitelist individual emails caught by the spam filter.

1. Click on Quarantine.
2. Check the email you wish to Manage.
3. Select Release to send the email to your inbox, Whitelist to add the sender to you whitelist or Delete to delete the email.

Please note: There is no limit to the number of emails that can be stored in quarantine, but any emails in there for longer than 21 days will be automatically deleted.