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| doc | ||
| examples | ||
| FAQ.d | ||
| INSTALL.d | ||
| S | ||
| W | ||
| X | ||
| .gitignore | ||
| ChangeLog | ||
| CREDITS | ||
| dist | ||
| FAQ | ||
| i3 | ||
| imapsync | ||
| imapsync-1.921 | ||
| index.shtml | ||
| INSTALL | ||
| LICENSE | ||
| Makefile | ||
| NOLIMIT | ||
| README | ||
| README_Windows.txt | ||
| README.txt | ||
| tests.sh | ||
| TODO | ||
| VERSION | ||
NAME
imapsync - Email IMAP tool for syncing, copying and migrating email
mailboxes between two imap servers, one way, and without duplicates.
VERSION
This documentation refers to Imapsync $Revision: 1.945 $
USAGE
To synchronize the source imap account
"test1" on server "test1.lamiral.info" with password "secret1"
to the destination imap account
"test2" on server "test2.lamiral.info" with password "secret2"
do:
imapsync \
--host1 test1.lamiral.info --user1 test1 --password1 secret1 \
--host2 test2.lamiral.info --user2 test2 --password2 secret2
DESCRIPTION
We sometimes need to transfer mailboxes from one imap server to one
another.
Imapsync command is a tool allowing incremental and recursive imap
transfers from one mailbox to another. If you don't understand the
previous sentence, it's normal, it's pedantic computer oriented jargon.
All folders are transferred, recursively, meaning the whole folder
hierarchy is taken, all messages in them, and all messages flags (\Seen
\Answered \Flagged etc.) are synced too.
Imapsync reduces the amount of data transferred by not transferring a
given message if it already resides on the destination side. Messages
that are on the destination side but not on the source side stay as they
are (see the --delete2 option to have a strict sync).
How imapsync knows a message is already on both sides? Same specific
headers and the transfer is done only once. By default, the
identification headers are "Message-Id:" and "Received:" lines but this
choice can be changed with the --useheader option.
All flags are preserved, unread messages will stay unread, read ones
will stay read, deleted will stay deleted.
You can abort the transfer at any time and restart it later, imapsync
works well with bad connections and interruptions, by design. On a
terminal hit Ctr-c twice within two seconds in order to abort the
program. Hit Ctr-c just once makes imapsync reconnect to both imap
servers.
A classical scenario is synchronizing a mailbox B from another mailbox A
in case you just want to keep a strict copy of A in B. Strict meaning
all messages in A will be in B but no more.
For this, option --delete2 has to be used, it deletes messages in host2
folder B that are not in host1 folder A. If you also need to destroy
host2 folders that are not in host1 then use --delete2folders. See also
--delete2foldersonly and --delete2foldersbutnot to set up exceptions on
folders to destroy (INBOX will never be destroy, it's a mandatory folder
in IMAP).
A different scenario is to delete the messages from the source mailbox
after a successful transfer, it can be a good feature when migrating
mailboxes since messages will be only on one side. The source account
will only have messages that are not on the destination yet, ie,
messages that arrived after a sync or that failed to be copied.
In that case, use the --delete1 option. Option --delete1 implies also
option --expunge1 so all messages marked deleted on host1 will be really
deleted. In IMAP protocol deleting a message does not really delete it,
it marks it with the flag \Deleted, allowing an undelete. Expunging a
folder removes, definitively, all the messages marked as \Deleted in
this folder.
You can also decide to remove empty folders once all of their messages
have been transferred. Add --delete1emptyfolders to obtain this
behavior.
Imapsync is not adequate for maintaining two active imap accounts in
synchronization when the user plays independently on both sides. Use
offlineimap (written by John Goerzen) or mbsync (written by Michael R.
Elkins) for a 2 ways synchronization.
OPTIONS
usage: imapsync [options]
Standard options are the six values forming the credentials, three on
each sides, needed to log in into the IMAP servers, ie, a host, a
username, and a password, two times.
Conventions used:
str means string
int means integer
reg means regular expression
cmd means command
--dry : Makes imapsync doing nothing for real, just print what
would be done without --dry.
OPTIONS/credentials
--host1 str : Source or "from" imap server.
--port1 int : Port to connect on host1.
Optional since default ports are the
well known ports 143 or 993.
--user1 str : User to login on host1.
--password1 str : Password for the user1.
--host2 str : "destination" imap server.
--port2 int : Port to connect on host2. Optional
--user2 str : User to login on host2.
--password2 str : Password for the user2.
--showpasswords : Shows passwords on output instead of "MASKED".
Useful to restart a complete run by just reading
the command line used in the log,
or to debug passwords.
It's not a secure practice.
--passfile1 str : Password file for the user1. It must contain the
password on the first line. This option avoids showing
the password on the command line like --password1 does.
--passfile2 str : Password file for the user2.
You can also pass the passwords in the environment variables
IMAPSYNC_PASSWORD1 and IMAPSYNC_PASSWORD2
OPTIONS/encryption
--nossl1 : Do not use a SSL connection on host1.
--ssl1 : Use a SSL connection on host1. On by default if possible.
--nossl2 : Do not use a SSL connection on host2.
--ssl2 : Use a SSL connection on host2. On by default if possible.
--notls1 : Do not use a TLS connection on host1.
--tls1 : Use a TLS connection on host1. On by default if possible.
--notls2 : Do not use a TLS connection on host2.
--tls2 : Use a TLS connection on host2. On by default if possible.
--debugssl int : SSL debug mode from 0 to 4.
--sslargs1 str : Pass any ssl parameter for host1 ssl or tls connection. Example:
--sslargs1 SSL_verify_mode=1 --sslargs1 SSL_version=SSLv3
See all possibilities in the new() method of IO::Socket::SSL
http://search.cpan.org/perldoc?IO::Socket::SSL#Description_Of_Methods
--sslargs2 str : Pass any ssl parameter for host2 ssl or tls connection.
See --sslargs1
--timeout1 int : Connection timeout in seconds for host1.
Default is 120 and 0 means no timeout at all.
--timeout2 int : Connection timeout in seconds for host2.
Default is 120 and 0 means no timeout at all.
OPTIONS/authentication
--authmech1 str : Auth mechanism to use with host1:
PLAIN, LOGIN, CRAM-MD5 etc. Use UPPERCASE.
--authmech2 str : Auth mechanism to use with host2. See --authmech1
--authuser1 str : User to auth with on host1 (admin user).
Avoid using --authmech1 SOMETHING with --authuser1.
--authuser2 str : User to auth with on host2 (admin user).
--proxyauth1 : Use proxyauth on host1. Requires --authuser1.
Required by Sun/iPlanet/Netscape IMAP servers to
be able to use an administrative user.
--proxyauth2 : Use proxyauth on host2. Requires --authuser2.
--authmd51 : Use MD5 authentication for host1.
--authmd52 : Use MD5 authentication for host2.
--domain1 str : Domain on host1 (NTLM authentication).
--domain2 str : Domain on host2 (NTLM authentication).
OPTIONS/folders
--folder str : Sync this folder.
--folder str : and this one, etc.
--folderrec str : Sync this folder recursively.
--folderrec str : and this one, etc.
--folderfirst str : Sync this folder first. --folderfirst "Work"
--folderfirst str : then this one, etc.
--folderlast str : Sync this folder last. --folderlast "[Gmail]/All Mail"
--folderlast str : then this one, etc.
--nomixfolders : Do not merge folders when host1 is case-sensitive
while host2 is not (like Exchange). Only the first
similar folder is synced (example: with folders
"Sent", "SENT" and "sent"
on host1 only "Sent" will be synced to host2).
--skipemptyfolders : Empty host1 folders are not created on host2.
--include reg : Sync folders matching this regular expression
--include reg : or this one, etc.
If both --include --exclude options are used, then
include is done before.
--exclude reg : Skips folders matching this regular expression
Several folders to avoid:
--exclude 'fold1|fold2|f3' skips fold1, fold2 and f3.
--exclude reg : or this one, etc.
--automap : guesses folders mapping, for folders well known as
"Sent", "Junk", "Drafts", "All", "Archive", "Flagged".
--f1f2 str1=str2 : Force folder str1 to be synced to str2,
--f1f2 overrides --automap and --regextrans2.
--subfolder2 str : Syncs the whole host1 folders hierarchy under the
host2 folder named str.
It does it internally by adding three
--regextrans2 options before all others.
Add --debug to see what's really going on.
--subfolder1 str : Syncs the host1 folders hierarchy under str
to the root hierarchy of host2.
It's the couterpart of a sync done by --subfolder2
when doing it in the reverse order.
Backup/Restore scenario:
Use --subfolder2 str for a backup to the folder str
on host2. Then use --subfolder1 str for restoring
from the folder str, after inverting
host1/host2 user1/user2 values.
--subscribed : Transfers subscribed folders.
--subscribe : Subscribe to the folders transferred on the
host2 that are subscribed on host1. On by default.
--subscribeall : Subscribe to the folders transferred on the
host2 even if they are not subscribed on host1.
--prefix1 str : Remove prefix str to all destination folders,
usually "INBOX." or "INBOX/" or an empty string "".
imapsync guesses the prefix if host1 imap server
does not have NAMESPACE capability. So this option
should not be used, most of the time.
--prefix2 str : Add prefix to all host2 folders. See --prefix1
--sep1 str : Host1 separator. This option should not be used,
most of the time.
Imapsync gets the separator from the server itself,
by using NAMESPACE, or it tries to guess it
from the folders listing (it counts
characters / . \\ \ in folder names and choose the
more frequent, or finally / if nothing is found.
--sep2 str : Host2 separator.
--regextrans2 reg : Apply the whole regex to each destination folders.
--regextrans2 reg : and this one. etc.
When you play with the --regextrans2 option, first
add also the safe options --dry --justfolders
Then, when happy, remove --dry, remove --justfolders.
Have in mind that --regextrans2 is applied after
the automatic prefix and separator inversion.
For examples see:
https://imapsync.lamiral.info/FAQ.d/FAQ.Folders_Mapping.txt
OPTIONS/folders sizes
--nofoldersizes : Do not calculate the size of each folder at the
beginning of the sync. Default is to calculate them.
--nofoldersizesatend: Do not calculate the size of each folder at the
end of the sync. Default is to calculate them.
--justfoldersizes : Exit after having printed the initial folder sizes.
OPTIONS/tmp
--tmpdir str : Where to store temporary files and subdirectories.
Will be created if it doesn't exist.
Default is system specific, Unix is /tmp but
/tmp is often too small and deleted at reboot.
--tmpdir /var/tmp should be better.
--pidfile str : The file where imapsync pid is written,
it can be dirname/filename.
Default name is imapsync.pid in tmpdir.
--pidfilelocking : Abort if pidfile already exists. Useful to avoid
concurrent transfers on the same mailbox.
OPTIONS/log
--nolog : Turn off logging on file
--logfile str : Change the default log filename (can be dirname/filename).
--logdir str : Change the default log directory. Default is LOG_imapsync/
OPTIONS/messages
--skipmess reg : Skips messages matching the regex.
Example: 'm/[\x80-ff]/' # to avoid 8bits messages.
--skipmess is applied before --regexmess
--skipmess reg : or this one, etc.
--pipemess cmd : Apply this cmd command to each message content
before the copy.
--pipemess cmd : and this one, etc.
With several --pipemess, the output of each cmd
command (STDOUT) is given to the input (STDIN)
of the next command.
For example,
--pipemess cmd1 --pipemess cmd2 --pipemess cmd3
is like a Unix pipe:
"cat message | cmd1 | cmd2 | cmd3"
--disarmreadreceipts : Disarms read receipts (host2 Exchange issue)
--regexmess reg : Apply the whole regex to each message before transfer.
Example: 's/\000/ /g' # to replace null by space.
--regexmess reg : and this one, etc.
OPTIONS/flags
If you encounter flag problems see also:
https://imapsync.lamiral.info/FAQ.d/FAQ.Flags.txt
--regexflag reg : Apply the whole regex to each flags list.
Example: 's/"Junk"//g' # to remove "Junk" flag.
--regexflag reg : then this one, etc.
--resyncflags : Resync flags for already transferred messages.
On by default.
--noresyncflags : Do not resync flags for already transferred messages.
May be useful when a user has already started to play
with its host2 account.
OPTIONS/deletions
--delete1 : Deletes messages on host1 server after a successful
transfer. Option --delete1 has the following behavior:
it marks messages as deleted with the IMAP flag
\Deleted, then messages are really deleted with an
EXPUNGE IMAP command. If expunging after each message
slows down too much the sync then use
--noexpungeaftereach to speed up, expunging will then be
done only twice per folder, one at the beginning and
one at the end of a folder sync.
--expunge1 : Expunge messages on host1 just before syncing a folder.
Expunge is done per folder.
Expunge aims is to really delete messages marked deleted.
An expunge is also done after each message copied
if option --delete1 is set (unless --noexpungeaftereach).
--noexpunge1 : Do not expunge messages on host1.
--delete1emptyfolders : Deletes empty folders on host1, INBOX excepted.
Useful with --delete1 since what remains on host1
is only what failed to be synced.
--delete2 : Delete messages in host2 that are not in
host1 server. Useful for backup or pre-sync.
--delete2 implies --uidexpunge2
--delete2duplicates : Delete messages in host2 that are duplicates.
Works only without --useuid since duplicates are
detected with an header part of each message.
--delete2folders : Delete folders in host2 that are not in host1 server.
For safety, first try it like this (it is safe):
--delete2folders --dry --justfolders --nofoldersizes
--delete2foldersonly reg : Deleted only folders matching regex.
Example: --delete2foldersonly "/^Junk$|^INBOX.Junk$/"
--delete2foldersbutnot reg : Do not delete folders matching regex.
Example: --delete2foldersbutnot "/Tasks$|Contacts$|Foo$/"
--noexpunge2 : Do not expunge messages on host2.
--nouidexpunge2 : Do not uidexpunge messages on the host2 account
that are not on the host1 account.
OPTIONS/dates
If you encounter problems with dates, see also:
https://imapsync.lamiral.info/FAQ.d/FAQ.Dates.txt
--syncinternaldates : Sets the internal dates on host2 same as host1.
Turned on by default. Internal date is the date
a message arrived on a host (Unix mtime).
--idatefromheader : Sets the internal dates on host2 same as the
ones in "Date:" headers.
OPTIONS/message selection
--maxsize int : Skip messages larger (or equal) than int bytes
--minsize int : Skip messages smaller (or equal) than int bytes
--maxage int : Skip messages older than int days.
final stats (skipped) don't count older messages
see also --minage
--minage int : Skip messages newer than int days.
final stats (skipped) don't count newer messages
You can do (+ are the messages selected):
past|----maxage+++++++++++++++>now
past|+++++++++++++++minage---->now
past|----maxage+++++minage---->now (intersection)
past|++++minage-----maxage++++>now (union)
--search str : Selects only messages returned by this IMAP SEARCH
command. Applied on both sides.
For a complete of what can be search see
https://imapsync.lamiral.info/FAQ.d/FAQ.Messages_Selection.txt
--search1 str : Same as --search but for selecting host1 messages only.
--search2 str : Same as --search but for selecting host2 messages only.
--search CRIT equals --search1 CRIT --search2 CRIT
--maxlinelength int : skip messages with a line length longer than int bytes.
RFC 2822 says it must be no more than 1000 bytes.
--useheader str : Use this header to compare messages on both sides.
Ex: Message-ID or Subject or Date.
--useheader str and this one, etc.
--usecache : Use cache to speed up the sync.
--nousecache : Do not use cache. Caveat: --useuid --nousecache creates
duplicates on multiple runs.
--useuid : Use UIDs instead of headers as a criterion to recognize
messages. Option --usecache is then implied unless
--nousecache is used.
OPTIONS/miscellaneous
--syncacls : Synchronizes acls (Access Control Lists).
--nosyncacls : Does not synchronize acls. This is the default.
Acls in IMAP are not standardized, be careful
since one acl code on one side may signify something
else on the other one.
--addheader : When a message has no headers to be identified,
--addheader adds a "Message-Id" header,
like "Message-Id: 12345@imapsync", where 12345
is the imap UID of the message on the host1 folder.
OPTIONS/debugging
--debug : Debug mode.
--debugfolders : Debug mode for the folders part only.
--debugcontent : Debug content of the messages transferred. Huge output.
--debugflags : Debug mode for flags.
--debugimap1 : IMAP debug mode for host1. Very verbose.
--debugimap2 : IMAP debug mode for host2. Very verbose.
--debugimap : IMAP debug mode for host1 and host2. Twice very verbose.
--debugmemory : Debug mode showing memory consumption after each copy.
--errorsmax int : Exit when int number of errors is reached. Default is 50.
--tests : Run local non-regression tests. Exit code 0 means all ok.
--testslive : Run a live test with test1.lamiral.info imap server.
Useful to check the basics. Needs internet connection.
--testslive6 : Run a live test with ks2ipv6.lamiral.info imap server.
Useful to check the ipv6 connectivity. Needs internet.
OPTIONS/specific
--gmail1 : sets --host1 to Gmail and options from FAQ.Gmail.txt
--gmail2 : sets --host2 to Gmail and options from FAQ.Gmail.txt
--office1 : sets --host1 to Office365 options from FAQ.Exchange.txt
--office2 : sets --host2 to Office365 options from FAQ.Exchange.txt
--exchange1 : sets options from FAQ.Exchange.txt, account1 part
--exchange2 : sets options from FAQ.Exchange.txt, account2 part
--domino1 : sets options from FAQ.Domino.txt, account1 part
--domino2 : sets options from FAQ.Domino.txt, account2 part
OPTIONS/behavior
--maxmessagespersecond int : limits the number of messages transferred per second.
--maxbytespersecond int : limits the average transfer rate per second.
--maxbytesafter int : starts --maxbytespersecond limitation only after
--maxbytesafter amount of data transferred.
--maxsleep int : do not sleep more than int seconds.
On by default, 2 seconds max, like --maxsleep 2
--abort : terminates a previous call still running.
It uses the pidfile to know what process to abort.
--exitwhenover int : Stop syncing and exits when int total bytes
transferred is reached.
--version : Print only software version.
--noreleasecheck : Do not check for new imapsync release
--releasecheck : Check for new imapsync release.
it's an http request to
http://imapsync.lamiral.info/prj/imapsync/VERSION
--noid : Do not send/receive ID command to imap servers.
--justconnect : Just connect to both servers and print useful
information. Need only --host1 and --host2 options.
Obsolete since "imapsync --host1 imaphost" alone
implies --justconnect
--justlogin : Just login to both host1 and host2 with users
credentials, then exit.
--justfolders : Do only things about folders (ignore messages).
--help : print this help.
Example: to synchronize imap account "test1" on "test1.lamiral.info"
to imap account "test2" on "test2.lamiral.info"
with test1 password "secret1"
and test2 password "secret2"
imapsync \
--host1 test1.lamiral.info --user1 test1 --password1 secret1 \
--host2 test2.lamiral.info --user2 test2 --password2 secret2
SECURITY
You can use --passfile1 instead of --password1 to give the password
since it is safer. With --password1 option, on Linux, any user on your
host can see the password by using the 'ps auxwwww' command. Using a
variable (like IMAPSYNC_PASSWORD1) is also dangerous because of the 'ps
auxwwwwe' command. So, saving the password in a well protected file (600
or rw-------) is the best solution.
Imapsync activates ssl or tls encryption by default, if possible.
What detailed behavior is under this "if possible"?
Imapsync activates ssl if the well known port imaps port (993) is open
on the imap servers. If the imaps port is closed then it open a normal
(clear) connection on port 143 but it looks for TLS support in the
CAPABILITY list of the servers. If TLS is supported then imapsync goes
to encryption.
If the automatic ssl/tls detection fails then imapsync will not protect
against sniffing activities on the network, especially for passwords.
If you want to force ssl or tls just use --ssl1 --ssl2 or --tls1 --tls2
See also the document FAQ.Security.txt in the FAQ.d/ directory or at
https://imapsync.lamiral.info/FAQ.d/FAQ.Security.txt
EXIT STATUS
Imapsync will exit with a 0 status (return code) if everything went
good. Otherwise, it exits with a non-zero status. Here is the list of
the exit code values (an integer between 0 and 255), the names reflects
their meaning:
EX_OK => 0 ; #/* successful termination */
EX_USAGE => 64 ; #/* command line usage error */
EX_NOINPUT => 66 ; #/* cannot open input */
EX_UNAVAILABLE => 69 ; #/* service unavailable */
EX_SOFTWARE => 70 ; #/* internal software error */
EXIT_CATCH_ALL => 1 ; # Any other error
EXIT_BY_SIGNAL => 6 ; # Should be 128+n where n is the sig_num
EXIT_PID_FILE_ERROR => 8 ;
EXIT_CONNECTION_FAILURE => 10 ;
EXIT_TLS_FAILURE => 12 ;
EXIT_AUTHENTICATION_FAILURE => 16 ;
EXIT_SUBFOLDER1_NO_EXISTS => 21 ;
EXIT_WITH_ERRORS => 111 ;
EXIT_WITH_ERRORS_MAX => 112 ;
EXIT_TESTS_FAILED => 254 ; # Like Test::More API
LICENSE AND COPYRIGHT
Imapsync is free, open, public but not always gratis software cover by
the NOLIMIT Public License. See the LICENSE file included in the
distribution or just read this simple sentence as it IS the licence
text:
"No limits to do anything with this work and this license."
In case it is not long enough, I repeat:
"No limits to do anything with this work and this license."
Look at https://imapsync.lamiral.info/LICENSE
AUTHOR
Gilles LAMIRAL <gilles@lamiral.info>
Good feedback good is always welcome. Bad feedback is very often
welcome.
Gilles LAMIRAL earns his living by writing, installing, configuring and
teaching free, open and often gratis software. Imapsync used to be
"always gratis" but now it is only "often gratis" because imapsync is
sold by its author, a good way to maintain and support free open public
software over decades.
BUGS AND LIMITATIONS
See https://imapsync.lamiral.info/FAQ.d/FAQ.Reporting_Bugs.txt
IMAP SERVERS supported
See https://imapsync.lamiral.info/S/imapservers.shtml
HUGE MIGRATION
If you have many mailboxes to migrate think about a little shell
program. Write a file called file.txt (for example) containing users and
passwords. The separator used in this example is ';'
The file.txt file contains:
user001_1;password001_1;user001_2;password001_2
user002_1;password002_1;user002_2;password002_2
user003_1;password003_1;user003_2;password003_2
user004_1;password004_1;user004_2;password004_2
user005_1;password005_1;user005_2;password005_2 ...
On Unix the shell program can be:
{ while IFS=';' read u1 p1 u2 p2; do
imapsync --host1 imap.side1.org --user1 "$u1" --password1 "$p1" \
--host2 imap.side2.org --user2 "$u2" --password2 "$p2" ...
done ; } < file.txt
On Windows the batch program can be:
FOR /F "tokens=1,2,3,4 delims=; eol=#" %%G IN (file.txt) DO imapsync ^
--host1 imap.side1.org --user1 %%G --password1 %%H ^
--host2 imap.side2.org --user2 %%I --password2 %%J ...
The ... have to be replaced by nothing or any imapsync option. Welcome
in shell or batch programming !
You will find already written scripts at
https://imapsync.lamiral.info/examples/
INSTALL
Imapsync works under any Unix with Perl.
Imapsync works under most Windows (2000, XP, Vista, Seven, Eight, Ten
and all Server releases 2000, 2003, 2008 and R2, 2012 and R2, 2016)
as a standalone binary software called imapsync.exe,
usually launched from a batch file in order to avoid always typing
the options.
Imapsync works under OS X as a standalone binary
software called imapsync_bin_Darwin
Purchase latest imapsync at
https://imapsync.lamiral.info/
You'll receive a link to a compressed tarball called imapsync-x.xx.tgz
where x.xx is the version number. Untar the tarball where
you want (on Unix):
tar xzvf imapsync-x.xx.tgz
Go into the directory imapsync-x.xx and read the INSTALL file.
As mentioned at https://imapsync.lamiral.info/#install
the INSTALL file can also be found at
https://imapsync.lamiral.info/INSTALL.d/INSTALL.ANY.txt
It is now split in several files for each system
https://imapsync.lamiral.info/INSTALL.d/
CONFIGURATION
There is no specific configuration file for imapsync, everything is
specified by the command line parameters and the default behavior.
HACKING
Feel free to hack imapsync as the NOLIMIT license permits it.
SIMILAR SOFTWARE
See also https://imapsync.lamiral.info/S/external.shtml
for a better up to date list.
Last updated and verified on Thu Apr 11, 2019.
imapsync : https://github.com/imapsync/imapsync
(this is an imapsync copy, sometimes delayed,
with --noreleasecheck by default since release 1.592, 2014/05/22)
imap_tools : https://web.archive.org/web/20161228145952/http://www.athensfbc.com/imap_tools/
The imap_tools code is now at
https://github.com/andrewnimmo/rick-sanders-imap-tools
imaputils : https://github.com/mtsatsenko/imaputils (very old imap_tools fork)
Doveadm-Sync : https://wiki2.dovecot.org/Tools/Doveadm/Sync ( Dovecot sync tool )
davmail : http://davmail.sourceforge.net/
offlineimap : http://offlineimap.org/
mbsync : http://isync.sourceforge.net/
mailsync : http://mailsync.sourceforge.net/
mailutil : http://www.washington.edu/imap/ part of the UW IMAP tookit.
imaprepl : https://bl0rg.net/software/ http://freecode.com/projects/imap-repl/
imapcopy (Pascal): http://www.ardiehl.de/imapcopy/
imapcopy (Java) : https://code.google.com/archive/p/imapcopy/
imapsize : http://www.broobles.com/imapsize/
migrationtool : http://sourceforge.net/projects/migrationtool/
imapmigrate : http://sourceforge.net/projects/cyrus-utils/
larch : https://github.com/rgrove/larch (derived from wonko_imapsync, good at Gmail)
wonko_imapsync : http://wonko.com/article/554 (superseded by larch)
pop2imap : http://www.linux-france.org/prj/pop2imap/ (I wrote that too)
exchange-away : http://exchange-away.sourceforge.net/
SyncBackPro : http://www.2brightsparks.com/syncback/sbpro.html
ImapSyncClient : https://github.com/ridaamirini/ImapSyncClient
MailStore : https://www.mailstore.com/en/products/mailstore-home/
mnIMAPSync : https://github.com/manusa/mnIMAPSync
imap-upload : http://imap-upload.sourceforge.net/
(a tool for uploading a local mbox file to IMAP4 server)
HISTORY
I initially wrote imapsync in July 2001 because an enterprise,
basystemes, paid me to install a new imap server without losing huge old
mailboxes located in a far away remote imap server, accessible by an
often broken low-bandwidth ISDN link.
I had to verify every mailbox was well transferred, all folders, all
messages, without wasting bandwidth or creating duplicates upon resyncs.
The design was made with the beautiful rsync command in mind.
Imapsync started its life as a patch of the copy_folder.pl script. The
script copy_folder.pl comes from the Mail-IMAPClient-2.1.3 perl module
tarball source (more precisely in the examples/ directory of the
Mail-IMAPClient tarball).
So many happened since then that I wonder if it remains any lines of the
original copy_folder.pl in imapsync source code.