Here is imapsync 2.305 /usr/lib/cgi-bin/imapsync on host ks8, a linux system with 0.8/3.8 free GiB of RAM, 17.67% used by processes.
with Perl 5.32.1 and Mail::IMAPClient 3.42
Transfer started at Friday 02 May 2025-05-02 04:16:07 +0000 UTC
PID is 1157528 my PPID is 428749
Log file is 2025_05_02_04_16_07_080__.txt ( to change it, use --logfile path ; or use --nolog to turn off logging )
Load is 0.45 0.43 0.45 1/215 on 4 cores
Real user id is www-data (uid 33)
Effective user id is www-data (euid 33)
$RCSfile: imapsync,v $ $Revision: 2.305 $ $Date: 2025/04/19 22:59:18 $ 
Command line used, run by /usr/bin/perl:
/usr/lib/cgi-bin/imapsync 
Under cgi context
Umask set with 0077 (was 0022)
REMOTE_ADDR is 3.144.16.26
REMOTE_HOST is ec2-3-144-16-26.us-east-2.compute.amazonaws.com
HTTP_USER_AGENT is Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
REQUEST_URI is /cgi-bin/imapsync
SERVER_SOFTWARE is Apache/2.4.62 (Debian)
SERVER_NAME is imapsync.lamiral.info
SERVER_ADDR is 5.135.176.149
SERVER_PORT is 443
SERVER_ADMIN is gilles@lamiral.info
Current directory is /var/tmp/imapsync_cgi/385d7a4d8d428d7aa2b57c8982629e2bd67698ed
Temp directory is /var/tmp/imapsync_cgi/385d7a4d8d428d7aa2b57c8982629e2bd67698ed ( to change it use --tmpdir dirpath )
Creating temp directory /var/tmp/imapsync_cgi/385d7a4d8d428d7aa2b57c8982629e2bd67698ed
kill -QUIT 1157528 # special behavior: call to sub catch_exit
kill -TERM 1157528 # special behavior: call to sub catch_exit
kill -INT 1157528 # special behavior: call to sub catch_reconnect
kill -HUP 1157528 # special behavior: call to sub catch_print
kill -USR1 1157528 # special behavior: call to sub toggle_sleep
Logging to a logfile by default. To turn off logging, use --nolog
File /var/tmp/imapsync_cgi/385d7a4d8d428d7aa2b57c8982629e2bd67698ed/imapsync.pid does not exist
PID file is /var/tmp/imapsync_cgi/385d7a4d8d428d7aa2b57c8982629e2bd67698ed/imapsync.pid ( to change it, use --pidfile filepath ; to avoid it use --pidfile "" )
Writing my PID 1157528 in /var/tmp/imapsync_cgi/385d7a4d8d428d7aa2b57c8982629e2bd67698ed/imapsync.pid
Writing also my logfile name in /var/tmp/imapsync_cgi/385d7a4d8d428d7aa2b57c8982629e2bd67698ed/imapsync.pid : 2025_05_02_04_16_07_080__.txt
Info: will resync flags for already transferred messages. Use --noresyncflags to not resync flags.
Info: turned ON syncinternaldates, will set the internal dates (arrival dates) on host2 same as host1.
Host1: will try to use LOGIN authentication on host1
Host2: will try to use LOGIN authentication on host2
Host1: imap connection timeout is 120 seconds
Host2: imap connection timeout is 120 seconds
Host1: imap connection keepalive is on on host1. Use --nokeepalive1 to disable it.
Host2: imap connection keepalive is on on host2. Use --nokeepalive2 to disable it.
Under CGI context, a timeout can occur from the webserver, see https://imapsync.lamiral.info/INSTALL.d/INSTALL.OnlineUI.txt
Checking each --regexflag command with an space string.
Ok with each --regexflag
Exiting with return value 0 (EX_OK: successful termination) 0/500 nb_errors/max_errors PID 1157528
Removing pidfile /var/tmp/imapsync_cgi/385d7a4d8d428d7aa2b57c8982629e2bd67698ed/imapsync.pid
Log file is 2025_05_02_04_16_07_080__.txt ( to change it, use --logfile filepath ; or use --nolog to turn off logging )