Challenge Response feature is very effective against spammers. It has to be enabled by the administrator of Mail Server but in case user has it enabled by administrator the WebMail lets user to manage his/her personal Challenge Response settings and authorize messages or to assign any action to any sender. e.g. reject messages from spammer@merakdemo.com, etc.
Challenge Response system engine receives messages and doesn't deliver the message to the user's mailbox until the sender of message is authorized. There are two ways of authorization:
Challenge Response engine generates a special web page to any received message from sender who is not authorized already. And it generates also special message to sender where the URL of such web page is written so sender can authorize himself/herself.
If user wants to authorize any sender or any pending message, WebMail allows a great interface for this.
The top of this dialog allows user to choose which messages/senders should be shown and user can also specify any word in Search sender field and then only senders containing specified word will be shown.
In the table the senders/messages can be selected and user can choose the action which should take place:
Of course, any record can be deleted too.
The bottom part of dialog allows user to easily change the Action which is assigned to particular sender. Senders can be loaded also from file. The structure of file has to be one address per line.