By default, <application>mutt</application> uses the <citerefentry><refentrytitle>vi</refentrytitle><manvolnum>1</manvolnum></citerefentry> editor for creating and replying to emails. Each user can customize this by creating or editing the <filename>.muttrc</filename> in their home directory and setting the <literal>editor</literal> variable or by setting the <envar>EDITOR</envar> environment variable. Refer to <uri xlink:href="http://www.mutt.org/">http://www.mutt.org/</uri> for more information about configuring <application>mutt</application>.