It seems Maildir is the safest mail format right now, as long as you could accept little performance and disk cost penalty.
On Wed, Apr 24, 2019 at 9:01 PM Tanstaafl via dovecot <dovecot@dovecot.org> wrote: > On Wed Apr 24 2019 04:12:30 GMT-0400 (Eastern Standard Time), Daniel > Miller via dovecot <dovecot@dovecot.org> wrote: > > If you've got good hardware, including a proper UPS, I'd recommend dbox > > (my server is presently using sdbox). With large mailboxes and > > file-based backups you'll benefit from mdbox. When reliability is the #1 > > concern above anything else - use maildir. Depending on your use SIS can > > have significant impact on storage requirements - but storage these days > > is relatively cheap. > > My plan when I roll out my new server this year is to use mdbox, but put > the indexes and other important meta data on a smallish volume using > either ZFS or BTRFS, for the automatic self-healing capabilities (and > the ability to expand it if necessary). > > This pretty much eliminates the worry about data loss from index file > corruption. > > > I haven't seen much feedback from users actively using SIS - I'd love to > > hear from high traffic sites with SIS experience to know if the > > corruption issues have been resolved. In my case there was at least a > > 30% reduction in space but I had too many errors - admittedly it's been > > a couple years since I last tried it. > > I never tried it because of the problems with respect to backup/restore, > and if I'm not mistaken, those problems have not been resolved. > > Maybe its a design issue... > > Or maybe it just isn't a high enough priority, like the missing > x-original-to header in the LMTP code that will still prevent me from > being able to use the otherwise much better LMTP delivery agent. >
