├── Dockerfile ├── LICENSE ├── README.md ├── entrypoint ├── postfix ├── sasl_passwd ├── sender_canonical_regexp ├── virtual └── virtual_regexp └── sendmail_test /Dockerfile: -------------------------------------------------------------------------------- 1 | FROM debian:9 2 | 3 | VOLUME ["/var/log", "/var/spool/postfix"] 4 | EXPOSE 25 5 | 6 | ENV HOST=localhost \ 7 | DOMAIN=localdomain \ 8 | INET_PROTOCOLS=ipv4 \ 9 | MAILNAME=localdomain \ 10 | MAIL_RELAY_HOST='' \ 11 | MAIL_RELAY_PORT='' \ 12 | MAIL_RELAY_USER='' \ 13 | MAIL_RELAY_PASS='' \ 14 | MAIL_VIRTUAL_FORCE_TO='' \ 15 | MAIL_VIRTUAL_ADDRESSES='' \ 16 | MAIL_VIRTUAL_DEFAULT='' \ 17 | MAIL_CANONICAL_DOMAINS='' \ 18 | MAIL_NON_CANONICAL_PREFIX='noreply+' \ 19 | MAIL_NON_CANONICAL_DEFAULT='' \ 20 | MESSAGE_SIZE_LIMIT=52428800 21 | 22 | RUN apt-get update && \ 23 | apt-get upgrade -yqq && \ 24 | echo "postfix postfix/mailname string $MAILNAME" | debconf-set-selections && \ 25 | echo "postfix postfix/main_mailer_type string 'Internet Site'" | debconf-set-selections && \ 26 | apt-get install -yqq postfix rsyslog iproute2 wget && \ 27 | apt-get clean -yqq && \ 28 | apt-get autoclean -yqq && \ 29 | apt-get autoremove -yqq && \ 30 | rm -rf /var/cache/apt/archives/* /var/cache/apt/*.bin /var/lib/apt/lists/* 31 | 32 | ARG DUMB_INIT=1.2.1 33 | RUN wget -O /usr/local/bin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v${DUMB_INIT}/dumb-init_${DUMB_INIT}_amd64 && \ 34 | chmod +x /usr/local/bin/dumb-init 35 | 36 | ADD postfix /etc/postfix 37 | ADD entrypoint sendmail_test /usr/local/bin/ 38 | 39 | RUN chmod a+rx /usr/local/bin/* && \ 40 | postconf -e inet_interfaces=all && \ 41 | postconf -e smtp_tls_security_level=may && \ 42 | postconf -e smtp_sasl_auth_enable=yes && \ 43 | postconf -e smtp_sasl_password_maps=hash:/etc/postfix/sasl_passwd && \ 44 | postconf -e smtp_sasl_security_options=noanonymous && \ 45 | postconf -e mydestination=localhost && \ 46 | postconf -e mynetworks_style=subnet && \ 47 | postconf -e smtp_helo_name=\$myhostname.\$mydomain && \ 48 | postconf -e virtual_maps='hash:/etc/postfix/virtual, regexp:/etc/postfix/virtual_regexp' && \ 49 | postconf -e sender_canonical_maps=regexp:/etc/postfix/sender_canonical_regexp && \ 50 | postconf -e local_header_rewrite_clients=static:all && \ 51 | postconf compatibility_level=2 && \ 52 | postmap /etc/postfix/sasl_passwd && \ 53 | postmap /etc/postfix/virtual_regexp && \ 54 | postmap /etc/postfix/virtual && \ 55 | postmap /etc/postfix/sender_canonical_regexp 56 | 57 | ENTRYPOINT ["/usr/local/bin/dumb-init", "--", "/usr/local/bin/entrypoint"] 58 | CMD ["tail", "-f", "/var/log/mail.log"] 59 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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Depending on the port, 28 | a specific security configuration will be used. 29 | - `MAIL_RELAY_USER`: The user to authenticate in `MAIL_RELAY_HOST`. 30 | - `MAIL_RELAY_PASS`: The password to authenticate in `MAIL_RELAY_HOST`. 31 | - `MAIL_CANONICAL_DOMAINS`: A space-separated list of domains that are 32 | considered [canonical][]. 33 | - `MAIL_NON_CANONICAL_DEFAULT`: A domain that should be found in the list of 34 | `MAIL_CANONICAL_DOMAINS`, which will be used as the replacement domain when 35 | a non-[canonical][] message comes in. Leave it empty to skip that 36 | replacement system. 37 | - `MAIL_CANONICAL_PREFIX`: Defaults to `noreply+`, and it is what will be 38 | prefixed to replaced non-[canonical][] sender addresses. 39 | - `MESSAGE_SIZE_LIMIT` in bytes, defaults to 50MiB. Most generous servers offer 40 | a limit of 25iMB (Gmail, Mailgun...), so by defaulting to 50MiB, basically 41 | we are forcing the remote server to fail in case of a big email, instead of 42 | making the local relay to fail. Change at will if you prefer a different 43 | behavior. 44 | - `ROUTE_CUSTOM` space separated list of subnets in the CIDR standard notation 45 | (e.g 192.168.0.0/16). 46 | 47 | ### Examples 48 | 49 | #### SMTP relay via Gmail 50 | 51 | docker container run \ 52 | -e MAIL_RELAY_HOST='smtp.gmail.com' \ 53 | -e MAIL_RELAY_PORT='587' \ 54 | -e MAIL_RELAY_USER='your_gmail_addr@gmail.com' \ 55 | -e MAIL_RELAY_PASS='your_gmail_pass' \ 56 | tecnativa/postfix-relay 57 | 58 | ## FAQ 59 | 60 | ### What Is A Canonical Domain 61 | 62 | It means "domains that are allowed to send from here". 63 | 64 | Suppose your app allows users to define their own emails, and that one is used 65 | to send emails to other users from the system. 66 | 67 | If you only own the `example.com` and `example.net` domains, but somebody 68 | configures his email as `pink@example.org`. If you send this email as it came, 69 | SPAM filters will block it. 70 | 71 | By defining `MAIL_CANONICAL_DOMAINS=example.com example.net` and 72 | `MAIL_NON_CANONICAL_DEFAULT=example.com`, the mail would be modified as if it 73 | came from `noreply+pink-example.org@example.com`, and SPAM filters will 74 | be happy with that. 75 | 76 | [canonical]: #what-is-a-canonical-domain 77 | -------------------------------------------------------------------------------- /entrypoint: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | set -e 4 | 5 | _add_line() { 6 | local check="$1" 7 | local line="$2" 8 | local file="$3" 9 | if ! grep -q "$check" "$file"; then 10 | echo "$line" >> "$file" 11 | fi 12 | } 13 | 14 | _log() { 15 | local logfile=/var/log/mail.log 16 | if [ ! -f $logfile ]; then 17 | touch $logfile 18 | chmod 640 $logfile 19 | fi 20 | echo "$(date '+%b %e %H:%I:%S') $(hostname) entrypoint[$$]: $1" >> $logfile 21 | } 22 | 23 | _stop() { 24 | /etc/init.d/postfix stop 25 | /etc/init.d/rsyslog stop 26 | _log "Docker entrypoint stop" 27 | } 28 | 29 | trap "_stop" SIGINT SIGTERM SIGHUP 30 | 31 | _log "Docker entrypoint start" 32 | 33 | routes=$(ip route | grep -v default | cut -d' ' -f1 | tr '\n' ' ') 34 | if [ -n "$ROUTE_CUSTOM" ]; then 35 | routes="$routes$ROUTE_CUSTOM" 36 | fi 37 | if [ -n "$routes" ]; then 38 | postconf -e mynetworks="127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 $routes" 39 | postconf -e inet_interfaces=all 40 | fi 41 | postconf -e "inet_protocols=$INET_PROTOCOLS" 42 | postconf -e "myhostname=$HOST" 43 | postconf -e "mydomain=$DOMAIN" 44 | echo $MAILNAME > /etc/mailname 45 | 46 | # Email size limits 47 | postconf -e message_size_limit=$MESSAGE_SIZE_LIMIT 48 | 49 | # Mail relay host 50 | if [ -n "$MAIL_RELAY_HOST" ] && [ -z "$MAIL_RELAY_PORT" ]; then 51 | postconf -e relayhost=$MAIL_RELAY_HOST; 52 | fi 53 | if [ -n "$MAIL_RELAY_HOST" ] && [ -n "$MAIL_RELAY_PORT" ]; then 54 | postconf -e relayhost="$MAIL_RELAY_HOST:$MAIL_RELAY_PORT"; 55 | fi 56 | if [ -n "$MAIL_RELAY_HOST" ] && [ -n "$MAIL_RELAY_USER" ] && [ -n "$MAIL_RELAY_PASS" ]; then 57 | _add_line "$MAIL_RELAY_HOST" "$MAIL_RELAY_HOST $MAIL_RELAY_USER:$MAIL_RELAY_PASS" /etc/postfix/sasl_passwd 58 | postmap /etc/postfix/sasl_passwd 59 | fi 60 | 61 | # Configure SMTPS wrapping if port is 465 62 | if [ "$MAIL_RELAY_PORT" == "465" ]; then 63 | postconf -e smtp_tls_wrappermode=yes 64 | postconf -e smtp_tls_security_level=encrypt 65 | fi 66 | 67 | # Force to send all emails to one email address 68 | if [ -n "$MAIL_VIRTUAL_FORCE_TO" ]; then 69 | _add_line "$MAIL_VIRTUAL_FORCE_TO" "/.+@.+/ $MAIL_VIRTUAL_FORCE_TO" /etc/postfix/virtual_regexp 70 | postmap /etc/postfix/virtual_regexp 71 | fi 72 | 73 | # Define some virtual email_to addresses 74 | if [ -n "$MAIL_VIRTUAL_DEFAULT" ] && [ -n "$MAIL_VIRTUAL_ADDRESSES" ]; then 75 | for addr in $MAIL_VIRTUAL_ADDRESSES; do 76 | _add_line "$addr" "$addr $MAIL_VIRTUAL_DEFAULT" /etc/postfix/virtual 77 | done 78 | postmap /etc/postfix/virtual 79 | fi 80 | 81 | # Define canonical and non-canonical sender domain 82 | if [ -n "$MAIL_CANONICAL_DOMAINS" ]; then 83 | for domain in $MAIL_CANONICAL_DOMAINS; do 84 | _add_line "{1}@$domain" "/^(.+)@${domain//\./\\.}$/ \${1}@$domain" /etc/postfix/sender_canonical_regexp 85 | done 86 | postmap /etc/postfix/sender_canonical_regexp 87 | fi 88 | 89 | if [ -n "$MAIL_NON_CANONICAL_DEFAULT" ]; then 90 | _add_line "{2}@$MAIL_NON_CANONICAL_DEFAULT" "/^(.+)@(.+)$/ $MAIL_NON_CANONICAL_PREFIX\${1}-\${2}@$MAIL_NON_CANONICAL_DEFAULT" /etc/postfix/sender_canonical_regexp 91 | postmap /etc/postfix/sender_canonical_regexp 92 | fi 93 | 94 | # Make sure no permission problems happen 95 | postfix set-permissions 96 | 97 | _log "Docker entrypoint configured" 98 | 99 | # Start syslog daemon 100 | /etc/init.d/rsyslog start 101 | 102 | # Start Postfix daemon 103 | /etc/init.d/postfix start 104 | 105 | $@ & wait ${!} 106 | -------------------------------------------------------------------------------- /postfix/sasl_passwd: -------------------------------------------------------------------------------- 1 | # sasl_passwd 2 | # This file define user:pass to login into SMTP relay hosts 3 | # 4 | # SMTP_RELAY_HOST USERNAME:PASSWORD 5 | -------------------------------------------------------------------------------- /postfix/sender_canonical_regexp: -------------------------------------------------------------------------------- 1 | # sender_canonical_regexp 2 | # This file will change email from address using regular expression 3 | # 4 | # Define canonical domains and non-canonical domain substitution 5 | # Then execute: 6 | # postmap /etc/postfix/sender_canonical_regexp 7 | # systemctl restart postfix.service 8 | # 9 | # Sample 1: Canonical domain (do not change from address) 10 | # /^(.+)@example.com$/ ${1}@example.com 11 | # 12 | # Sample 2: Non-canonical domain (change from address using canonical domain) 13 | # /^(.+)@(.+)$/ noreply+${1}+${2}@example.com 14 | -------------------------------------------------------------------------------- /postfix/virtual: -------------------------------------------------------------------------------- 1 | # virtual 2 | # This file will change email to address 3 | # 4 | # Add one line per email to address to change 5 | # Then execute: 6 | # postmap /etc/postfix/virtual 7 | # systemctl restart postfix.service 8 | # 9 | # TO_ADDRESS CHANGED_TO_ADDRESS 10 | -------------------------------------------------------------------------------- /postfix/virtual_regexp: -------------------------------------------------------------------------------- 1 | # virtual_regexp 2 | # This file will change email to address using regular expression 3 | # 4 | # Un-comment this line to send all email to one email address 5 | # Then execute: 6 | # postmap /etc/postfix/virtual_regexp 7 | # systemctl restart postfix.service 8 | # 9 | # /.+@.+/ catchall@example.com 10 | -------------------------------------------------------------------------------- /sendmail_test: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | set -e 4 | 5 | user=test 6 | from_name='Test' 7 | from_email=$1 8 | to_name='Your name' 9 | to_email=$2 10 | file=/tmp/emailtest.eml 11 | 12 | if [ -z "$from_email" ] || [ -z "$to_email" ]; then 13 | echo "Usage: $(basename $0) " 14 | exit 1 15 | fi 16 | 17 | echo -n "Preparing email ... " 18 | cat > $file << EOL 19 | Subject: Email test for $HOST.$DOMAIN 20 | From: $from_name <$from_email> 21 | To: $to_name <$to_email> 22 | Content-Type: text/plain; charset=UTF-8 23 | 24 | This is a test email for server $HOST.$DOMAIN. 25 | You do not have to do anything, but remove it. 26 | Thanks 27 | 28 | EOL 29 | echo "OK" 30 | 31 | echo -n "Sending email using sendmail ... " 32 | sendmail -f "$from_email" "$to_email" < $file 33 | error=$?; if [ $error -ne 0 ]; then echo "ERROR: $error"; exit $error; fi 34 | echo "OK" 35 | 36 | echo -n "Waiting some seconds ... " 37 | sleep 5 38 | echo "OK" 39 | 40 | echo "-----------------------------------------------------" 41 | echo " Log" 42 | echo "-----------------------------------------------------" 43 | tail /var/log/syslog 44 | 45 | echo "-----------------------------------------------------" 46 | echo " Outgoing email queue" 47 | echo "-----------------------------------------------------" 48 | postqueue -p 49 | --------------------------------------------------------------------------------