Operating Principles

The analysis of messages, received from Dr.Web MailD (or any other external application) for the signs of spam is performed using VadeRetro anti-spam solution developed by VadeSecure. Analysis of messages is performed in a stand-alone mode, without requests to external sources of information on spam. This solution also provides a high rate of message processing and constant improvement of the message analysis quality due to the dynamic update of the database of rules for spam classification of messages (update is performed automatically via Dr.Web Updater).

Users are provided with the opportunity to create own component (external application) using Dr.Web ASE for anti-spam checks of email messages. For this, Dr.Web ASE contains a special API, based on Google Protobuf. To obtain Dr.Web ASE API guide and examples of client application using Dr.Web ASE, contact Doctor Web partner care department (https://partners.drweb.com/).

Note that Dr.Web ASE normalizes points granted to email messages by the anti-spam library VadeRetro by modifying them into a number from zero to one (percentage rating). Approximate concordance table of VadeRetro points and ratings (percentage) of Dr.Web ASE is below.

VadeRetro points	Dr.Web ASE percentage
0 or less	0.00
0—10	0.00—0.19
10—50	0.19—0.63
50—100	0.63—0.80
100—150	0.80—0.86
150—200	0.86—0.90
200—300	0.90—0.93
300—400	0.93—0.95
400—500	0.95 – 0.96
500 and more	0.96—1.00

To get the exact value p of Dr.Web ASE percentage for the indicated number of points of VadeRetro b, you can use the following formula: p = 2 · arctg(0.030777 · b) / π.

If any email messages are falsely detected by the VadeRetro anti-spam library, it is recommended that they are forwarded to special addresses for analysis and improvement of spam filter quality:

•email messages, incorrectly assessed as spam, should be forwarded to vrnonspam@drweb.com;

•spam email messages, which were not detected as spam, should be forwarded to vrspam@drweb.com.

Each email message that is subject to analysis should be preliminary saved in the .eml format. Saved files should be attached to the email message sent to the required service address.