+ <varlistentry>
+ <term>--set-header header:value</term>
+ <listitem>
+ <para>
+ The program sets or changes value for the header to the given value
+ (only at the top-level message).
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>--set-param header:param=value</term>
+ <listitem>
+ <para>
+ The program sets or changes value for the header's parameter to the
+ given value (only at the top-level message). The header must exist.
+ </para>
+ </listitem>
+ </varlistentry>
+