Re: How to debug 'ignoring non-mail file' issues

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+From: David Bremner <david@tethera.net>\r
+To: Perttu Luukko <perttu.luukko@iki.fi>, notmuch@notmuchmail.org\r
+Subject: Re: How to debug 'ignoring non-mail file' issues\r
+In-Reply-To: <20140831074059.GA13399@rakuuna.dhcp.inet.fi>\r
+References: <20140831074059.GA13399@rakuuna.dhcp.inet.fi>\r
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+Date: Sun, 31 Aug 2014 07:41:42 -0700\r
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+Perttu Luukko <perttu.luukko@iki.fi> writes:\r
+\r
+\r
+> The vast majority of these ignored mails are not ignored after I\r
+> transfer them with offlineimap to another computer. I can non-ignore\r
+> these files probably by copying the renamed file back to the mail\r
+> server, so this is fixable. Offlineimap shouldn't mess with the file's\r
+> contents, so is there something that can cause notmuch to ignore a file\r
+> based on its name?\r
+\r
+The most likely cause is that the files are mboxes, whether intentional\r
+or not.  In particular if they start with a "From " (note the lack of :)\r
+and contain a second "From " at the beginning of a line later in the\r
+file. In this case something like sed can replace the initial \r
+"From " with "X-Envelope-From: ".\r
+\r
+I agree that the error message could be more informative in this case.\r
+\r
+d\r