-if [[ $old_host != $MAIL_HOST ]]; then
- read -p "warning: \$old_host != \$MAIL_HOST: $old_host != $MAIL_HOST, proceed? y/N "
+if [[ $old_host != "$MAIL_HOST" ]]; then
+ read -r -p "warning: \$old_host != \$MAIL_HOST: $old_host != $MAIL_HOST, proceed? y/N "