+.SH DEFAULT ACTION
+.rs
+.sp
+If none of the options that specifies a specific action (such as starting the
+daemon or a queue runner, or testing an address, or receiving a message in a
+specific format, or listing the queue) are present, and there is at least one
+argument on the command line, \\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.
+