On these three pages you can manage parameters of interaction of Dr.Web MailD on the protected mail server with email servers (MTA) via Milter, Spamd and Rspamd interfaces (the same parameters are used for all of these interfaces):
•Use heuristic analysis—define how Dr.Web MailD uses the heuristic analysis to detect unknown threats in email messages received for scanning via the relevant interface. Using the heuristic analysis slows down scanning but improves its reliability.
•Timeout to scan one message—set a time limit for scanning an email message received for scanning via the Milter interface. If the value is 0, time period for scanning one message is not limited.
•Maximum nesting level. On this page you can manage settings used by Dr.Web MailD to scan compound files embeded in email messages, such as archives, mail files, packed objects and other containers (i.e. compound files that are not related to any of the types indicated above).
You can specify the nesting level limit for each of the file types in the corresponding field; when this limit is exceeded, Dr.Web MailD will not unpack a file of such type during scanning. For example, to scan the contents of the archives that are nested in archives, specify the nesting level limit of no less than 2. To disable scanning of nested objects, specify 0 as the maximum nesting level for the corresponding type of containers.
Note that increasing the maximum nesting level slows down scanning.
The Maximum compression ratio field allows you to specify the maximum compression ratio (as a compressed/uncompressed file ratio) for objects to be scanned. If the compression ratio of a file being scanned exceeds the specified value, the file will not be scanned.
•Socket for connections of MTA via Milter (Spamd, Rspamd)—define a socket for connecting to the MTA (the MTA will connect to this socket when using Dr.Web MailD as a filter). You can specify a Unix socket (a path in the local file system of the protected server) or a network socket (an IPaddress::port pair).
•Block unchecked email messages—select this check box to block email messages received for scanning via the relevant interface, if they could not be scanned by Dr.Web MailD.
•Email processing rules for Milter (Spamd, Rspamd)—define rules to be applied by Dr.Web MailD to messages received from the relevant interface.
To add a new rule to the list, click 
in the corresponding row of the list. To remove a rule from the list, click 
in the corresponding row of the list.