.code
variant=rspamd Use Rspamd rather than SpamAssassin protocol
time=<start>-<end> Use only between these times of day
+tmo=<timespec> Connection time limit.
weight=<value> Selection bias
backup Use only if all non-backup servers fail
.endd
Time specifications for the &`time`& option are <hour>.<minute>.<second>
in the local time zone; each element being one or more digits.
+Either the seconds or both minutes and seconds, plus the leading &`.`&
+characters, may be omitted and will be taken as zero.
+
+Timeout specifications for the &`tmo`& option are the usual Exim
+time interval standard, eg. &`20s`& or &`1m`&.
+The default value is two minutes.
Servers are queried in a random fashion, weighted by the selection bias.
The default value for selection bias is 1.