[offlineimap] Use mail 'date' as file prefix if using utime_from_header. (#265)

[Sébastien Gross]

The documentation has been added.

---
Reply to this email directly or view it on GitHub:
https://github.com/OfflineIMAP/offlineimap/pull/265#issuecomment-153656519
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://alioth-lists.debian.net/pipermail/offlineimap-project/attachments/20151104/41aa5d4d/attachment-0002.html>