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32
33 <h3 class="section">10.6 Known CMail Problems</h3>
34
35 <p>It's possible that a strange conjunction of conditions may occasionally
36 mean that <samp><span class="file">cmail</span></samp> has trouble reactivating an existing
37 XBoard. If this should happen, simply trying it again should work. 
38 If not, remove the file that stores the XBoard's PID
39 (<samp><span class="file">game.pid</span></samp>) or use the &lsquo;<samp><span class="samp">-xreuse</span></samp>&rsquo; option to force
40 <samp><span class="file">cmail</span></samp> to start a new XBoard.
41
42    <p>Versions of <samp><span class="file">cmail</span></samp> after 2.16 no longer understand the old file format
43 that XBoard used to use and so cannot be used to correspond with
44 anyone using an older version.
45
46    <p>Versions of <samp><span class="file">cmail</span></samp> older than 2.11 do not handle multi-game messages,
47 so multi-game correspondence is not possible with opponents using an older
48 version.
49
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