+.B \-header\-field
+.I name:body
+switch adds a header field with the specified name and body to the
+message. There need not be a space after the colon that separates the
+name and body in the argument to this switch. It is usually best to
+enclose the argument in quotes to protect it from the shell. The
+.B \-header\-field
+switch may be given multiple times to add multiple header fields,
+for example,
+.PP
+.RS 5
+.nf
+mhmail -from sender@example.com \\
+-header\-field 'MIME-Version:1.0' \\
+-header\-field 'Content-Type:text/plain; charset=utf-8' \\
+-header\-field 'Content-Transfer-Encoding:8bit' \\
+recipient@example.com
+.fi
+.RE
+.PP
+Note about this example: the
+.B \-attach
+switch causes
+.I MIME-Version
+and
+.I Content-Type
+headers to be added to the message.
+.PP
+The