Postfix docker relay

Run docker container for relay using uvoo/email-relay

• https://github.com/uvoo/containers/tree/main/uvoo/email-relay
• You usually want to remove -e SMTP_TLS_SECURITY_LEVEL="none" line so it requires encrypted communictions

docker rm postfix -f || true
mkdir -p data
cd data
mkdir -p keys logs spool_postfix
sudo chmod 0755 keys logs spool_postfix
cd ../
docker run -p 8587:25 \
  -e SMTP_USERNAME=tester@localhost \
  -e SMTP_USERPASS=PleaseChangeMe \
  -e SMTP_USERS="tester@localhost:PleaseChangeMe tester1@localhost:PleaseChangeMe" \
  -e MYNETWORKS="127.0.0.0/8 172.16.0.0/12 10.210.77.1/32" \
  -e DKIM_DOMAINS="example.com" \
  -e DKIM_SELECTORS="default mail" \
  -e MYHOSTNAME="localrelay.example.com" \
  -e RELAYHOST="relay.example.com:587" \
  -e SMTP_TLS_SECURITY_LEVEL="none" \
  -v ${PWD}/data/keys:/etc/opendkim/keys \
  -v ${PWD}/data/logs:/var/log/mail\
  -v ${PWD}/data/spool_postfix:/var/spool/postfix \
  --hostname localrelay.example.com \
  --name postfix -d uvoo/email-relay

Test email

#!/usr/bin/python3
import smtplib
from email.mime.text import MIMEText

# Email details
from_addr = f"noreply@example.com"
to_addr = f"jeremy.busk@example.com"
subject = "Hello"
body = "This is a test email."

# Create the email
msg = MIMEText(body)
msg["Subject"] = subject
msg["From"] = from_addr
msg["To"] = to_addr

# Send the email
server = smtplib.SMTP("localhost", 8587)
server.send_message(msg)
server.quit()

print("Email sent.")