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From: Eric S Fraga <e.fraga@ucl.ac.uk>
Subject: Re: Maildir++ subfolders
Date: Tue, 15 Sep 2020 12:16:09 +0100
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On Tuesday, 15 Sep 2020 at 14:04, Kevin Shell wrote:
> I'm big fan of Maildir/Maildir++ format.

I also am a big fan of this format, especially as I read email on
different systems with synchronized file systems.  Maildir is ideal to
avoid inconsistent systems or overwriting.  

However, nnmaildir does not scale well, having what I estimate to be
O(n^3) time to rescan/re-index folders.  With large nnmaildir folders
(>10000 messages), nnmaildir becomes unusable.

I've moved to nnml instead, using folder names that include the system
name (via gnus splitting) and virtual groups to collect the emails from
different systems for presentation.  With nnml, there is no need to
re-index groups (or it's trivial for gnus to do so).

-- 
Eric S Fraga via Emacs 28.0.50 & org 9.3.7 on Debian bullseye/sid