Re: [Evolution] IMAP - Junk and Trash folder appear twice

[Tom <tom prost-net de>]

Am Montag, den 16.05.2016, 16:05 +0100 schrieb Pete Biggs: 
> > > With a real trash the message is actually moved to the folder when it
> > > is deleted and it disappears completely from the original folder.
> >                      ^^^^^^ 
> > Can we be sure about that or how it's programmed ? For all I know IMAP
> > specification has neither a MOVE nor a DELETE command for single
> > messages. Can you go into detail how a standard IMAP server would do
> > this move or post a point of knowledge ?
>
> The MOVE command is an IMAP extension detailed in RFC6851
>
>   https://tools.ietf.org/html/rfc6851
>
> How the server implements it is unimportant so long as it appears as a
> single operation to the client.  If Evo sees the "MOVE" command as an
> extension reported in the CAPABILITIES directive, then it will use it,
> otherwise it falls back to COPY+DELETE.
>
> Modern servers fall into two categories really: database driven or
> Maildir backed.  With both these a MOVE is trivial: with a database you
> just change the record in the database so that the message appears to
> be elsewhere in IMAP; and with Maildir it is just a single filesystem
> atomic 'mv' command (well, it's done through system commands, but just
> amounts to moving the inode reference in the directory entries - no
> bytes are actually moved!).

In particular for those whose mother-tongue isn't English: The RFCs are
not distinguishing between mailbox and folder, e.g. IMAP4 clients can
create, rename, and/or delete mailboxes (usually presented to the user
as folders) on the server, and copy messages between mailboxes. Multiple
mailbox support also allows servers to provide access to shared and
public folders ...

... since in German, we wouldn't term a folder a mailbox !?