Gmail to Dovecot migration

[Yuri]

An update:
I was able to migrate using 3rd option (Google Takeout + mb2md).  After
running mb2md I converted from Maildir++ (dotted) folders to
hierarchical folders by hand, moved everything from under Inbox/cur to
cur, and removed Inbox folder.  Then simply copied the converted
folders to mail_location and restarted Dovecot.  Dovecot seemed to re-
index everything and I was able to access my converted account from
Evolution.  Things would be simpler if I didn't use hierarchical
folders (LAYOUT=fs).  
One thing I noticed there is some duplication of messages in Inbox and
Archived folders.  Another thing is I'm not sure if I can merge Inbox
and Archvied folders into a single Inbox folder (I can try).  And I'd
still would very much like to use Option #1 (doveadm backup directly
from gmail), so if anyone has any success with this option please share
your experience.
Thank you,Yuri
On Sun, 2019-08-11 at 15:05 -0700, Yuri via dovecot wrote:
> Hi everyone,
> I'm trying to migrate my gmail to dovecot following instructions at 
> https://wiki.dovecot.org/Migration/Gmail
> Using -a 'virtual/All' option does not seem to work because the gmail
> folder with that name does not exist, but -a '[Gmail]/All Mail' seem
> to work.  I'm using the following command:
> sudo doveadm \-o imapc_host=imap.gmail.com \-o 
> imapc_user=user at gmail.com \-o imapc_password=gmailpassword \-o
> imapc_features="rfc822.size gmail-migration" \-o imapc_port=993 \-o
> imapc_ssl=imaps \-o ssl_client_ca_dir=/etc/ssl/certs \-o
> imapc_ssl_verify=yes \backup -a '[Gmail]/All Mail' -O '-
> $GmailHaveLabels' -R -u user at exmaple.com imapc:
> The problem is this command only migrates approximately 25% of my
> emails by size.  Google Takeout exports 4 times more data in mbox
> format, the size of exported mboxes aligns with what Google tells me
> a the bottom of gmail settings page.
> I experimented with other options of 'doveadm backup' command, but
> they all resulted in less data being migrated. The above options are
> the best I was able to achive so far.
> Another option I was considering is to convert Google Takeout mboxes
> to dovecot format. I tried using 'doveadm import' command, but got
> confused with various user and search query options of the
> command.  The best I was able to achive was to output a folder under
> /Takeout which mimics my mbox structure, but with no imported
> messages.
> A third option I'm considering is to convert Google Takeout mboxes
> using mb2md command.  Conversion seems to work fine, but the output
> is in the traditional (dotted) format, and for historical reasons I
> use 'LAYOUT=fs' option.  So I need to do some extra work to convert
> folder names.  And even if I do so, I'm still not sure if I can
> import Maildir to dovecot because dovecot's Maildir has other
> information, such as indices, logs, etc., not just email folders.
> I'll keep investigating the second and the third option because it
> seems that Google Takeout gives me all my emails, but I'm not sure if
> those are the right paths.
> I wanted to ask the experts about the best option to migrate gmail to
> dovecot.  Has anyone being able to successfully migrate all their
> emails from gmail and what steps have been used for that?
> My Dovecot version: 2.3.4.1
> Thank you,Yuri
> 
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