Send with SMTP

import nodemailer from "nodemailer";

const transporter = nodemailer.createTransport({
  host: "smtp.sequenzy.com",
  port: 587,
  secure: false, // true for port 465, false for 587/2525
  auth: {
    user: "api",
    pass: process.env.SEQUENZY_API_KEY,
  },
});

await transporter.sendMail({
  from: "you@your-verified-domain.com",
  to: "recipient@example.com",
  subject: "Hello from Sequenzy",
  html: "<h1>Hello!</h1><p>This email was sent via SMTP.</p>",
});

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

msg = MIMEMultipart("alternative")
msg["Subject"] = "Hello from Sequenzy"
msg["From"] = "you@your-verified-domain.com"
msg["To"] = "recipient@example.com"

html = "<h1>Hello!</h1><p>This email was sent via SMTP.</p>"
msg.attach(MIMEText(html, "html"))

with smtplib.SMTP("smtp.sequenzy.com", 587) as server:
    server.starttls()
    server.login("api", os.environ["SEQUENZY_API_KEY"])
    server.sendmail(msg["From"], msg["To"], msg.as_string())

use PHPMailer\PHPMailer\PHPMailer;

$mail = new PHPMailer(true);

$mail->isSMTP();
$mail->Host = 'smtp.sequenzy.com';
$mail->SMTPAuth = true;
$mail->Username = 'api';
$mail->Password = $_ENV['SEQUENZY_API_KEY'];
$mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
$mail->Port = 587;

$mail->setFrom('you@your-verified-domain.com', 'Your Name');
$mail->addAddress('recipient@example.com');
$mail->isHTML(true);
$mail->Subject = 'Hello from Sequenzy';
$mail->Body = '<h1>Hello!</h1><p>This email was sent via SMTP.</p>';

$mail->send();

package main

import (
    "net/smtp"
    "os"
)

func main() {
    apiKey := os.Getenv("SEQUENZY_API_KEY")
    auth := smtp.PlainAuth("", "api", apiKey, "smtp.sequenzy.com")

    to := []string{"recipient@example.com"}
    msg := []byte("To: recipient@example.com\r\n" +
        "From: you@your-verified-domain.com\r\n" +
        "Subject: Hello from Sequenzy\r\n" +
        "Content-Type: text/html\r\n" +
        "\r\n" +
        "<h1>Hello!</h1><p>This email was sent via SMTP.</p>\r\n")

    smtp.SendMail("smtp.sequenzy.com:587", auth, "you@your-verified-domain.com", to, msg)
}

require 'mail'

Mail.defaults do
  delivery_method :smtp, {
    address: 'smtp.sequenzy.com',
    port: 587,
    user_name: 'api',
    password: ENV['SEQUENZY_API_KEY'],
    authentication: :plain,
    enable_starttls_auto: true
  }
end

Mail.deliver do
  from    'you@your-verified-domain.com'
  to      'recipient@example.com'
  subject 'Hello from Sequenzy'
  html_part do
    content_type 'text/html; charset=UTF-8'
    body '<h1>Hello!</h1><p>This email was sent via SMTP.</p>'
  end
end

# Install: brew install swaks (macOS) or apt install swaks (Ubuntu)
swaks --to recipient@example.com \
  --from you@your-verified-domain.com \
  --server smtp.sequenzy.com \
  --port 587 --tls \
  --auth LOGIN \
  --auth-user "api" \
  --auth-password "$SEQUENZY_API_KEY" \
  --header "Subject: Hello from Sequenzy" \
  --body "This is a test email sent via SMTP"