Script to automatically Archive emails in all mailboxes, Does not require doveadm which is useful as often shared hosting does not have this installed

archive-dovecot.sh

#!/bin/bash
##############################################################
# Author: Brendan Scullion
# Date: 11-May-2020
# Description:
#       Run on a weekly or daily basis from crontab. In this example i am 
#       archiving all emails in every mailbox older that 1.5 Years. emails are moved to
#       to the archive folder grouped by month and keep the original folder structure.       
##############################################################
MAILROOT=/home/user/mail/domain.example.com

/bin/ls -d $MAILROOT/* | while read USER_MAIL_ROOT; do

    find $USER_MAIL_ROOT -mtime +545 -type f -name "*${HOSTNAME}*" -print | grep -v $USER_MAIL_ROOT/.Archive | while IFS=$\n read -r email; do
        T=$(/bin/ls -l --time-style="+%s" "$email"|  sed -e "s/  / /g" | cut -d' ' -f6);
        EMAIL_FILE=$(echo ${email##*/};);
        REL_DIR=$(echo $email | sed -e "s^${EMAIL_FILE}^^g" | sed -e "s^${USER_MAIL_ROOT}/^^g");
        
        if [ $email == $USER_MAIL_ROOT/cur/$EMAIL_FILE ]; then
 
            ARCH_DIR=$(date --date="@$T" "+${USER_MAIL_ROOT}/.Archive.%Y.%m/${REL_DIR}");
            if [ ! -d $ARCH_DIR ]; then
                mkdir -p $ARCH_DIR;    
            fi
            mv $email $ARCH_DIR$EMAIL_FILE;
        else
            ARCH_DIR=$(date --date="@$T" "+${USER_MAIL_ROOT}/.Archive.%Y.%m${REL_DIR}");
            if [ ! -d $ARCH_DIR ]; then
                mkdir -p $ARCH_DIR;    
            fi   
            mv $email $ARCH_DIR$EMAIL_FILE;
        fi
    done;
done;