On Mon, 2022-02-21 at 11:55 -0600, c. marlow wrote:
> What format does Evolution use to store emails in?

Of the few folders mine does store locally, it's in maildir.  I don't
know if that's user-selectable, though.  The preferences window even
says it's maildir for the default "on this computer" folder, but that
folder's not editable (there's only an enable/disable entire folder
option for it).

I suspect though, that internally it sticks with maildir for storing
any mail it's fetched itself.  All the local mail folders I see in
~/.local/share/evolution/mail/ are maildir.

Maildir is a later improvement on MH (according to other authors), so
I'll take their word on that and not debate it, but it's a similar
scheme of individual files for each message, though without an index
file.

You can create non-network accounts where it'll read mail files that
are already on the drive (something else will have to bring them onto
the computer), and then you have a choice of local delivery (no clues
in the preferences interface as to what it reads), MH format, maildir
format, standard Unix mbox spool directory, and standard Unix mbox
spool file.

I seem to recall importing old mail spool files into Evolution, years
ago, simply by dragging and dropping a spool file onto a mail folder
inside Evolution's window, and it automatically handled parsing it. 
I'm fairly sure that was how I finally moved my old mailspool files
from the old Dovecot mail server into the new Dovecot server using
maildir.  Every mail moving tool I'd looked at seemed to require a
computing degree to understand how to drive it.

For my mail it accesses through my IMAP server, it doesn't appear to be
caching them anywhere that I can see (and I've not asked it to).

Seeing how you mentioned satellite internet, that's one of the laggiest
systems and you probably are best off pre-fetching all your mail as a
batch, whatever protocol you use.  Then you're just stepping through
your local cache as you read them.
 
-- 
 
uname -rsvp
Linux 3.10.0-1160.53.1.el7.x86_64 #1 SMP Fri Jan 14 13:59:45 UTC 2022 x86_64
 
Boilerplate:  All unexpected mail to my mailbox is automatically deleted.
I will only get to see the messages that are posted to the mailing list.
 
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