SMTP Integration — Send from Any App or Framework

import smtplib
import os
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart

msg = MIMEMultipart("alternative")
msg["Subject"] = "Welcome!"
msg["From"] = "Your App <noreply@yourdomain.com>"
msg["To"] = "user@example.com"

msg.attach(MIMEText("Thanks for signing up.", "plain"))
msg.attach(MIMEText("<p>Thanks for signing up.</p>", "html"))

with smtplib.SMTP("smtp.arkhq.io", 587) as server:
    server.starttls()
    server.login(
        os.environ["SMTP_USERNAME"],
        os.environ["SMTP_PASSWORD"]
    )
    server.sendmail(msg["From"], msg["To"], msg.as_string())

require "mail"

Mail.defaults do
  delivery_method :smtp, {
    address: "smtp.arkhq.io",
    port: 587,
    user_name: ENV["SMTP_USERNAME"],
    password: ENV["SMTP_PASSWORD"],
    authentication: :plain,
    enable_starttls_auto: true
  }
end

Mail.deliver do
  from    "Your App <noreply@yourdomain.com>"
  to      "user@example.com"
  subject "Welcome!"
  body    "Thanks for signing up."
end

<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;

$mail = new PHPMailer(true);

$mail->isSMTP();
$mail->Host       = 'smtp.arkhq.io';
$mail->SMTPAuth   = true;
$mail->Username   = getenv('SMTP_USERNAME');
$mail->Password   = getenv('SMTP_PASSWORD');
$mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
$mail->Port       = 587;

$mail->setFrom('noreply@yourdomain.com', 'Your App');
$mail->addAddress('user@example.com');
$mail->Subject = 'Welcome!';
$mail->Body    = '<p>Thanks for signing up.</p>';
$mail->AltBody = 'Thanks for signing up.';

$mail->send();

package main

import (
    "net/smtp"
    "os"
)

func main() {
    auth := smtp.PlainAuth(
        "",
        os.Getenv("SMTP_USERNAME"),
        os.Getenv("SMTP_PASSWORD"),
        "smtp.arkhq.io",
    )

    msg := []byte("To: user@example.com\r\n" +
        "Subject: Welcome!\r\n" +
        "Content-Type: text/plain; charset=utf-8\r\n" +
        "\r\n" +
        "Thanks for signing up.\r\n")

    smtp.SendMail(
        "smtp.arkhq.io:587",
        auth,
        "noreply@yourdomain.com",
        []string{"user@example.com"},
        msg,
    )
}

# settings.py
EMAIL_BACKEND = "django.core.mail.backends.smtp.EmailBackend"
EMAIL_HOST = "smtp.arkhq.io"
EMAIL_PORT = 587
EMAIL_USE_TLS = True
EMAIL_HOST_USER = os.environ.get("SMTP_USERNAME")
EMAIL_HOST_PASSWORD = os.environ.get("SMTP_PASSWORD")
DEFAULT_FROM_EMAIL = "Your App <noreply@yourdomain.com>"

// .env
MAIL_MAILER=smtp
MAIL_HOST=smtp.arkhq.io
MAIL_PORT=587
MAIL_USERNAME="${SMTP_USERNAME}"
MAIL_PASSWORD="${SMTP_PASSWORD}"
MAIL_ENCRYPTION=tls
MAIL_FROM_ADDRESS=noreply@yourdomain.com
MAIL_FROM_NAME="${APP_NAME}"

# application.yml
spring:
  mail:
    host: smtp.arkhq.io
    port: 587
    username: ${SMTP_USERNAME}
    password: ${SMTP_PASSWORD}
    properties:
      mail:
        smtp:
          auth: true
          starttls:
            enable: true