exim config for 'notmuch insert' retry

diff --git a/5f/05c206c21d6876968922650a3de49a3bbf3c53 b/5f/05c206c21d6876968922650a3de49a3bbf3c53
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+Date: Tue, 16 Dec 2014 11:31:33 +0000\r
+From: Edward Betts <edward@4angle.com>\r
+To: notmuch@notmuchmail.org\r
+Subject: exim config for 'notmuch insert' retry\r
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+\r
+Short version: exim has an option to retry delivery when notmuch insert fails\r
+\r
+Long version:\r
+\r
+I'm using maildrop and 'notmuch insert' to sort and tag my incoming mail.\r
+Sometimes 'notmuch insert' isn't able to write to the notmuch index because\r
+another process is holding the notmuch write lock. At first when this happened\r
+exim would just bounce the message.\r
+\r
+I could use the '--keep' option so 'notmuch insert' would write the message to\r
+the maildir, but not index it. It would later be picked up by running 'notmuch\r
+new' from cron. The problem is that the initial tagging is defined in the\r
+maildrop config. I would need to specify my tagging rules in two different\r
+places.\r
+\r
+For me, a better approach would be if the undeliverable message could be added\r
+to a queue, ready for another delivery attempt. I realised that this is exactly\r
+what an MTA like exim is designed to do. I added the 'temp_errors = 1' option\r
+to the maildrop pipe transport, this tells exim that delivery errors are\r
+temporary and it should retry failed deliveries.\r
+\r
+I'm sharing this information in case other people find it useful.\r
+\r
+Here is the complete maildrop pipe transport from my exim4.conf:\r
+\r
+maildrop_pipe:\r
+  driver = pipe\r
+  path = "/bin:/usr/bin:/usr/local/bin"\r
+  command = "/usr/bin/maildrop"\r
+  temp_errors = 1\r
+  message_prefix =\r
+  message_suffix =\r
+  log_defer_output = true\r
+  return_path_add\r
+  delivery_date_add\r
+  envelope_to_add\r
+\r
+-- \r
+Edward.\r