-<p>If fetchmail is supposed to retrieve all
-mail from a mailbox reliably, without being disturbed by someone
-occasionally using another client on another host, or a webmailer, or
-similar, then <em>client</em>-side tracking of the state is
-indispensable. This is also needed to match behavior to ETRN and ODMR.</p>
+<p>If fetchmail is supposed to retrieve all mail from a mailbox
+reliably, without being disturbed by someone occasionally using another
+client on another host, or a webmailer, or similar, then
+<em>client</em>-side tracking of the state is indispensable. This is
+also needed to match behavior to ETRN and ODMR or to support read-only
+mailboxes in --keep mode.</p>