This requires that you activated the SSH access via CPanel.
Works well with hostmonster, bluehost and in general with any chrooted environment based on CPanel, where you don't have root password / sudo access. I haven't tried it on WHM based hosting providers.
#!/bin/bash
OWNER=$@
CONTACT=`ls -1A /var/cpanel/users/`
count=1
for x in `echo -n "$CONTACT"`;do
users=`grep -i ^dns /var/cpanel/users/"$x" |cut -d= -f2`
DOMAIN[$count]=$users
count=$[$count+1]
echo "Login: `echo "$x"`"
for i in `echo "${DOMAIN[@]}" | sed 's/ /\n/g'`;do
for n in ` ls -A /home/"$x"/mail/"$i"/ 2>/dev/null`;do
if [ "$n" == "cur" ];then echo "$n" > /dev/null
elif [ "$n" == "new" ];then echo "$n" > /dev/null
elif [ "$n" == "tmp" ];then echo "$n" > /dev/null
elif [ "$n" == "" ];then echo "$n" > /dev/null
else
echo "$n"@"$i"
fi
done
done
echo;
echo;
done