program needs to schedule events that happen at future
timesfor example, processing the queue. Internally, such
events are set by specifying an interval to wait before the event is
to begin. In the unusual instance that any such interval is less than
or equal to zero, sendmail will log a message
such as the following:
554 5.3.0 setevent: intvl=seconds
Here, the leading 5.3.0 is reported because such an error can happen
during an SMTP session. The seconds will print
as zero or as a negative number.
Should you ever see this error, the problem will most likely be found
in a bad time specification in your configuration file.