Ran into an issue where it looked like imapsync would fail to connect to the server on the first line when trying to do a bulk move.

mail.maildomain.com;user1@incredigeek.com;password1;mail.incredigeek.com;user2@incredigeek.com;password2

Was able to work around the issue by Adding a comment line to the top of the file. May have to do with how the script I was using handles the lines.

### Email Import list mail.maildomain.com;user1@incredigeek.com;password1;mail.incredigeek.com;user2@incredigeek.com;password2

Script used to copy

#!/bin/sh
# $Id: sync_loop_unix.sh,v 1.6 2015/11/04 18:23:04 gilles Exp gilles $ 
#Example for imapsync massive migration on Unix systems.
#See also http://imapsync.lamiral.info/FAQ.d/FAQ.Massive.txt
#
Data is supposed to be in file.txt in the following format:
host001_1;user001_1;password001_1;host001_2;user001_2;password001_2; … 
#Separator is character semi-colon ";" it can be changed by any character changing IFS=';' in the while loop below.
# Each line contains 6 columns, columns are parameter values for
--host1 --user1 --password1 --host2 --user2 --password2
and a trailing empty fake column to avoid CR LF part going
in the 6th parameter password2. Don't forget the last semicolon.
# You can add extra options after the variable "$@" Use character backslash \ at the end of each supplementary line, xcept for the last one. You can also pass extra options via the parameters of this script since they will be in "$@" The credentials filename "file.txt" used for the loop can be renamed by changing "file.txt" below. echo Looping on account credentials found in file.txt
echo
file="${1}"
{ while IFS=',' read  h1 u1 p1 h2 u2 p2 fake
    do 
        { echo "$h1" | egrep "^#" ; } > /dev/null && continue # this skip commented lines in file.txt
        echo "==== Starting imapsync from host1 $h1 user1 $u1 to host2 $h2 user2 $u2 ===="
         imapsync --host1 "$h1" --user1 "$u1" --password1 "$p1" \
                  --host2 "$h2" --user2 "$u2" --password2 "$p2" \
                  "$@" --delete2
         echo "==== Ended imapsync from host1 $h1 user1 $u1 to host2 $h2 user2 $u2 ===="
         echo
    done 
} < ${file}