#!/bin/bash
MYPATH=$(dirname "$(readlink -f $0))")
cd $MYPATH

user="root"
server="myrestricted.server"
mail="my_email@address.fake"

ssh ${user}@${server} cat /var/mail/${user} | \
    FILENO=$(date +%s001) \
    formail -i "To: $mail" -k -R From: Old-From: -X Subject: -X Date: -X To: -X Old-To: -ds sh -c \
    'cat > outbox/msg.$FILENO' && \
    ssh ${user}@${server} 'echo "" > /var/mail/${user}'
for msg in outbox/msg.*; do
    cat $msg | msmtp -C .msmtprc -t -v && rm -f $msg
    sleep 15
done