+.SH DEFAULT ACTION
+.rs
+.sp
+If no options are present that require a specific action (such as starting the
+daemon or a queue runner, testing an address, receiving a message in a specific
+format, or listing the queue), and there is at least one command line argument,
+then \fB-bm\fR (accept a local message on the standard input, with the
+arguments specifying the recipients) is assumed. Otherwise, Exim outputs a
+brief message about itself and exits.
+