<p>I'm cleaning up some old Maildir folders, and finding messages with names like:</p>

<p>1095812260.M625118P61205V0300FF04I002DC537_0.redoak.cise.ufl.edu,S=2576:2,ST</p>

<p>They don't show up in my IMAP client, so I presume there's some semaphore indicating the message already got moved somewhere else. Is that the case, and can the files be deleted without remorse?</p>

[{'answer_id': 70173, 'author': 'Erik Forsberg', 'author_id': 8675, 'author_profile': 'https://Stackoverflow.com/users/8675', 'pm_score': 5, 'selected': True, 'text': '<p>The \'M\' is just part of the unique filename and has nothing to do with the fact that the mail doesn\'t show up in mail clients. </p>\n\n<p>The \'T\' at the end of the filename, after the \':\' sign, however tells the IMAP server that this message is Trashed.</p>\n\n<p>See <a href="http://cr.yp.to/proto/maildir.html" rel="noreferrer">http://cr.yp.to/proto/maildir.html</a></p>\n'}, {'answer_id': 70175, 'author': 'Mr Shark', 'author_id': 6093, 'author_profile': 'https://Stackoverflow.com/users/6093', 'pm_score': 0, 'selected': False, 'text': '<p>IMAP, is a protocol for communicating to a message storage, the actual storage is standardised in other ways. The filename looks like a <a href="http://en.wikipedia.org/wiki/Maildir" rel="nofollow noreferrer">Maildir</a> filename where I think does not put any meaning into the first part of the filename, but you have to check with your software manual.</p>\n'}]
['https://Stackoverflow.com/questions/70140', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/10841/']