General-Purpose Mail Filter
In addition to the usual data types (see Statements in GNU Mailutils Manual),
introduces the following two special ones:
The time interval specification is a string that defines an interval, much the same way we do this in English: it consists of one or more pairs ‘number’-‘time unit’. For example, the following are valid interval specifications:
1 hour 2 hours 35 seconds 1 year 7 months 2 weeks 2 days 11 hours 12 seconds
The pairs can occur in any order, however unusual it may sound to a human ear, e.g. ‘2 days 1 year’. If the ‘time unit’ is omitted, seconds are supposed.
A named pipe (socket).
An IPv4 connection to host address at port port. Port must be specified either as a decimal number or as a string representing the port name in /etc/services.
An IPv6 connection to host address at port port. This port type is not yet supported.
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