IOdesk comes with a build in anti-spam system to prevent spam from reaching the ticket management system. At times though you might have a user sending in spam from a non-blacklisted e-mail and this is where the blocked e-mails system comes into play.
To access the settings for blocked e-mails enter IOdesk and navigate to
Application settings -> Blocked Emails.
In this view, you can add e-mails to the blacklist and manage the ones already added to the blacklist.
An e-mail added to the blacklist will not be able to contact your company through any of the modules, including the chat. So use this with care and only with addresses you are certain are spam, or that you for other reasons do not wish to be able to contact you.