After losing network connection, imapsync appears to not be able to sync ~2000 missed emails. about imapsync

[gilleslamiral]

https://imapsync.lamiral.info/README

  OPTIONS/messages
...
     --skipcrossduplicates : Avoid copying messages that are already copied
                             in another folder, good from Gmail to XYZ when
                             XYZ is not also Gmail.
                             Activated with --gmail1 unless --noskipcrossduplicates

     --debugcrossduplicates : Prints which messages (UIDs) are skipped with
                              --skipcrossduplicates and in what other folders
                              they are.

https://imapsync.lamiral.info/FAQ.d/FAQ.Gmail.txt

Q. How to synchronize from Gmail to XXX?

R. Use this example:

imapsync \
           --user1     [email protected] \
           --password1 gmailsecret \
           --host2     imap.example.org \
           --user2     tata \
           --password2 tatasecret \
           --gmail1

Or, replacing what does --gmail1 (values are from imapsync 2.178):

imapsync \
           --host1     imap.gmail.com \
           --ssl1 \
           --user1     [email protected] \
           --password1 gmailsecret \
           --host2     imap.example.org \
           --user2     tata \
           --password2 tatasecret \
           --maxbytespersecond 40_000 \
           --maxbytesafter 3_000_000_000 \
           --automap \
           --maxsleep 2 \
           --skipcrossduplicates \
           --useheader="X-Gmail-Received" \
           --useheader "Message-Id" \
           --regextrans2 "s,\[Gmail\].,," \
           --folderlast  "[Gmail]/All Mail"

With --gmail1 you can override the parameters
that are activated by them, for example:

imapsync ... --gmail1 --maxbytespersecond 50_000 --noskipcrossduplicates --noautomap

Explanations:

--maxbytespersecond 40_000 ( 40 kBytes/s ) option is here to avoid 
locking or errors when imap transfers exceed Gmail maximum limit. 
See http://support.google.com/a/bin/answer.py?hl=en&answer=1071518
--maxbytespersecond 40_000 is not mandatory in the sense Gmail may
allow you to use an upper value than 2 GBytes per 24h without
disconnections.

--useheader="X-Gmail-Received" --useheader "Message-Id" are not
mandatory. I use them because I found (several years ago, it may have
changed) that Gmail always adds a different header "X-Gmail-Received:"
to all messages it gets. So the identification by imapsync can not
fail using this header. "Message-Id" is there for safety about this
Gmail rule.

--automap is optional but it will save manual folder names changes or
the use of --regextrans2 to map folder names.

--regextrans2 "s,\[Gmail\].,,"
If your destination imap server doesn't like the "[Gmail]" name, 
get rid of this "[Gmail]" part with that.

You can select folders exported to imap within the Gmail preferences,
for example, you may unselect all "System labels".

--skipcrossduplicates is optional but it can save Gigabytes of hard
disk memory. Within imap protocol, Gmail presents Gmail labels as
folders, so a message labelled "Work" "ProjectX" "Urgent" ends up in
three different imap folders "Work" "ProjectX" and "Urgent" after an
imap sync. Option --skipcrossduplicates prevent this behavior.

An issue with --skipcrossduplicates is that the first label synced by
imapsync goes to its corresponding folder but other labels are then
ignored. You can choose what labels have priority by using the
--folderfirst option. For example, --folderfirst "Work" will sync
messages labelled "Work" before messages labelled "CanWait" or
"Urgent". By default imapsync syncs folders (Gmail labels) using the
classical alphanumeric order.

Option --folderlast "CanWait" will sync only messages that only have
the label CanWait.

Option --folderlast "[Gmail]/All Mail", in conjunction with option
--skipcrossduplicates will only put in "[Gmail]/All Mail" the messages
that are not labelled at all.

[komali2]

This may actually be because these emails exist in the stupid Important folder. Investigating.

[komali2]

It was cause gmail had these items in other folders, and All Mail, and imapsync wasn't duplicating them. There's probably settings to get them to duplicate into Archive like I want, but instead in gmail's webmail I just removed all items from folders like Important, deleted those folders on the new migadu IMAP side, and then resynced. Now it all looks like I'd hoped.