run.sh

# https://github.com/bokysan/docker-postfix
# Check if we need to configure the container timezone
if [ ! -z "$TZ" ]; then
    TZ_FILE="/usr/share/zoneinfo/$TZ"
    if [ -f "$TZ_FILE" ]; then
        echo -e "‣ Setting container timezone to: $TZ"
        ln -snf "$TZ_FILE" /etc/localtime
        echo "$TZ" >/etc/timezone
    else
        echo -e "‣ Cannot set timezone to: $TZ -- this timezone does not exist."
    fi
else
    echo -e "‣ Not setting any timezone for the container"
fi

# https://samhobbs.co.uk/2016/01/mx-backup-postfix-email-server
# Make and reown postfix folders
mkdir -p /var/spool/postfix/ && mkdir -p /var/spool/postfix/pid
chown root: /var/spool/postfix/
chown root: /var/spool/postfix/pid

# Disable SMTPUTF8, because libraries (ICU) are missing in alpine
postconf -e smtputf8_enable=no

# Update aliases database. It's not used, but postfix complains if the .db file is missing
postalias /etc/postfix/aliases

if [[ ! -z "$HOSTNAME" && ! -z "$DOMAINS" ]]; then
    echo -e "‣ Setting myhostname: $HOSTNAME"
    postconf -e myhostname=$HOSTNAME
    postconf -e myorigin=$HOSTNAME
    postconf -e mydestination=$HOSTNAME,localhost
    echo -e "‣ Setting relay_domains: $DOMAINS"
    postconf -e relay_domains=$DOMAINS
    postconf -e relayhost=
    postconf -e proxy_interfaces=$HOSTNAME
fi

# Increase the allowed header size, the default (102400) is quite smallish
postconf -e header_size_limit=4096000

# Restriction lists
postconf -e smtpd_client_restrictions=
postconf -e smtpd_sender_restrictions=
postconf -e smtpd_helo_required=yes
postconf -e smtpd_helo_restrictions=permit_mynetworks,reject_invalid_helo_hostname,reject_non_fqdn_helo_hostname,reject_unknown_helo_hostname
postconf -e smtpd_recipient_restrictions=
postconf -e smtpd_relay_restrictions=permit_mynetworks,reject_unauth_destination

echo -e "‣ Starting: rsyslog, postfix"
exec supervisord -c /etc/supervisord.conf