On Antispam tab, you can configure anti-spam settings for Dr.Web for Microsoft Exchange Server plug-in:
•Check mail for spam option allows Dr.Web for Microsoft Exchange Server to check mail for spam by plug-in. The option is enabled by default. If this option is disabled, mail is not checked for spam.
•Use white and black lists option is intended for using lists containing trusted and distrusted addresses. The option is enabled by default. If this option is disabled, white and black lists are not used.
Actions group contains the following settings:
•Certainly spam. This option is intended for performing an appropriate action on the object, defined as spam by the plug-in. The following actions are available:
▫Add a prefix to headers of spam messages. With this action selected, the subject of the message, defined as spam, contains the prefix defined in Prefix field.
▫Block. With this action selected, the message, defined as spam, is blocked by the plug-in.
▫Redirect. With this action selected, the message, defined as spam, is forwarded to the email address, specified in Redirection address field.
▫Move to junk. With this action selected, the message, defined as spam, a X-MS-Exchange-Organization-SCL header is added, together with the message distrust index score. This header is recognized by Microsoft mail clients and Microsoft Exchange Server. If the score is between 4 and 7, the clients move such message to the Junk folder.
•Probably spam. This option is intended for performing an appropriate action on the object, defined as probable spam by the plug-in. The following actions are available:
▫Add a prefix to headers of spam messages. With this action selected, the subject of the message, defined as probable spam, contains the prefix, defined in Prefix field.
▫Block. With this action selected, the message, defined as probable spam, is blocked by the plug-in.
▫Redirect. With this action selected, the message, defined as probable spam, is forwarded to the email address, specified in Redirection address field.
▫Move to junk. With this action selected, the message, defined as probable spam, a X-MS-Exchange-Organization-SCL header is added, together with the message distrust index score. This header is recognized by Microsoft mail clients and Microsoft Exchange Server. If the score is between 4 and 7, the clients move such message to the Junk folder.
•Unlikely spam. This option is intended for performing an appropriate action on the object, defined as unlikely being a spam by the plug-in. The following actions are available:
▫Add a prefix to headers of spam messages. With this action selected, the subject of the message, defined as unlikely being a spam, contains the prefix, defined in Prefix field.
▫Block. With this action selected, the message, defined as unlikely being a spam, is blocked by the plug-in.
▫Redirect. With this action selected, the message, defined as unlikely being a spam, is forwarded to the email address, specified in Redirection address field.
▫Move to junk. With this action selected, the message, defined as unlikely being a spam, a X-MS-Exchange-Organization-SCL header is added, together with the message distrust index score. This header is recognized by Microsoft mail clients and Microsoft Exchange Server. If the score is between 4 and 7, the clients move such message to the Junk folder.
•Redirection address. This field is intended to specify the email address, where messages, defined as spam, or probable spam, or unlikely being a spam are forwarded. To specify a new address, enter it in this field.
•Prefix. This field is intended to specify the prefix for messages, defined as spam, or probable spam, or unlikely being a spam. Default value is: ***SPAM***. To change the prefix, enter the new prefix in this field.
Managing lists of trusted and distrusted email addresses
•Black list. To add an address to a black list, enter the address in this field. To add more addresses to a black list, click the 
button, the new field appears. To delete unneeded fields of a black list, click the 
button.
•White list. To add an address to a white list, enter the address in this field. To add more addresses to a black list, click the button, the new field appears. To delete unneeded fields of a white list, click the button.
After configuring the options and actions, click Save right upper of the workspace of the plug-in configuration page.