User Guide

Appendix A 91
Records in application cache are not removed automatically after their
TTL expiry (the application at that does not use the outdated records).
The frequency used to remove obsolete records from the cache is
determined by the IPCacheRefreshPeriod,
UnreachableCacheRefreshPeriod, MXCacheRefreshPeriod, and
UnresolvedCacheRefreshPeriod parameters.
MXCacheRefreshPeriod=60…259200
– time (seconds), which must elapse
before the application removes from its cache MX records with expired
TTL. The default value is: 43200 (12 hours).
UnreachableCacheRefreshPeriod=60…259200
– time (seconds), which
must elapse before the application removes from its cache records
about unreachable hosts with expired TTL. The time-to-live for the
records about unreachable hosts is specified by the UnreachableTTL
parameter. The default value is: 43200 (12 hours).
UnresolvedCacheRefreshPeriod=60…259200 – time (seconds), which
must elapse before the application removes from its cache information
about unresolved hosts not found in DNS. The time-to-live for the
records about unresolved hosts is specified by the UnresolvedTTL
parameter. The default value is: 43200 (12 hours).
UnresolvedTTL=0…3600 – time-to-live (seconds) in the application cache
for records of unresolved hosts not found in DNS. During this time, the
application will not perform repeated DNS requests about this host. The
default value is: 600 (10 minutes).
UnreachableTTL=0…3600 – time-to-live (in seconds) in the application
cache for records of unreachable hosts. During this time, the application
will not attempt to connect to this host. The default value is: 600 (10
minutes).
Please note that the value, set for the UnreachableTTL
parameter should be less than MinimalBackoffTime in the
[smtpgw. timeouts] section. Otherwise, the application may
try to send a message before the record about an
unreachable host in its cache expires. As a result, the
application will find old information about unreachable host in
cache and will not attempt to send such a message.
The [smtpgw.policy] section contains the default settings for processing email
messages:
Check=true|false – defines the anti-virus scanning mode for all mail
messages included into the particular group of recipients/senders. To
disable the mode (i.e., configure the application to bypass the anti-virus
scanning of messages), set the option to false. Required parameter.
AdminNotifyAddress – email address to which the application will send
notifications for the administrator regarding the processing results for