#!/bin/sh
set -e
if [ -f /tmp/container_is_terminating ]; then
    exit 0
fi

check_postfix() {
    printf "EHLO healthcheck\nquit\n" | \
    { while read l ; do sleep 1; echo $l; done } | \
    nc -w 2 127.0.0.1 587 | \
    grep -qE "^220.*ESMTP Postfix"
}

check_dkim() {
    if [ -f /tmp/no_open_dkim ]; then
        return
    fi
    printf '\x18Clocalhost\x004\x00\x00127.0.0.1\x00' | nc -w 2 127.0.0.1 8891
}

check_postfix
check_dkim