Testing with SMTP

const nodemailer = require('nodemailer');

(async () => {
  const transport = nodemailer.createTransport({
    service: 'Mailosaur',
    auth: {
      user: 'SERVER_ID@mailosaur.net',
      pass: 'SMTP_PASSWORD'
    }
  });

  await transport.sendMail({
    subject: 'A test email',
    from: 'Our Company <from@example.com>',
    to: 'Test User <to@example.com>',
    html: '<p>Hello world.</p>',
    text: 'Hello world.'
  });
})();

import smtplib

sender = "Our Company <from@example.com>"
recipient = "Test User <to@example.com>"

message = f"""\
Subject: A test email
To: {recipient}
From: {sender}

Hello world."""

with smtplib.SMTP("smtp.mailosaur.net", 2525) as server:
    server.login("SERVER_ID@mailosaur.net", "SMTP_PASSWORD")
    server.sendmail(sender, recipient, message)

// Uses javax.mail
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.mailosaur.net");
props.put("mail.smtp.port", "2525");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.ssl.protocols", "TLSv1.2");
props.put("mail.smtp.ssl.trust", "smtp.mailosaur.net");

Session session = Session.getInstance(props, new Authenticator() {
  @Override
  protected PasswordAuthentication getPasswordAuthentication() {
    return new PasswordAuthentication("SERVER_ID@mailosaur.net", "SMTP_PASSWORD");
  }
});

MimeMessage message = new MimeMessage(session);

message.setSubject("A test email");
message.setFrom(new InternetAddress("Our Company <from@example.com>"));
message.setRecipient(MimeMessage.RecipientType.TO, new InternetAddress("Test User <to@example.com>"));

MimeBodyPart mimeBodyPart = new MimeBodyPart();
mimeBodyPart.setContent("<p>Hello world.</p>", "text/html; charset=utf-8");

Multipart multipart = new MimeMultipart();
multipart.addBodyPart(mimeBodyPart);

message.setContent(multipart);

session.getTransport("smtp").send(message);

using MimeKit;
using MailKit.Security;
using MimeKit.Text;

var message = new MimeMessage();
message.From.Add(new MailboxAddress("Our Company", "from@example.com"));
message.To.Add(new MailboxAddress("Test User", "to@example.com"));
message.Subject = "A test email";

message.Body = new TextPart(TextFormat.Html) {
  Text = "<p>Hello world.</p>"
};

using (var emailClient = new MailKit.Net.Smtp.SmtpClient()) {
  emailClient.Connect("smtp.mailosaur.net", 2525, SecureSocketOptions.StartTls)
  emailClient.Authenticate("SERVER_ID@mailosaur.net", "SMTP_PASSWORD");
  emailClient.Send(message);
  emailClient.Disconnect(true);
}

require 'net/smtp'

message = <<MESSAGE_END
From: Our Company <from@example.com>
To: Test User <to@example.com>
Subject: A test email

Hello world.
MESSAGE_END

Net::SMTP.start(
  'smtp.mailosaur.net',
  2525,
  'smtp.mailosaur.net',
  'SERVER_ID@mailosaur.net', 'SMTP_PASSWORD', :cram_md5
) do |smtp|
  smtp.send_message message, 'from@example.com', 'to@example.com'
end

// Install with `composer require nette/mail`
require_once('vendor/autoload.php');

$smtp = new Nette\Mail\SmtpMailer([
  'host' => 'smtp.mailosaur.net',
  'port' => 2525,
  'username' => 'SERVER_ID@mailosaur.net',
  'password' => 'SMTP_PASSWORD',
  'secure' => 'starttls',
]);

$message = new Nette\Mail\Message;
$message->setFrom('Our Company <from@example.com>')
  ->addTo('Test User <to@example.com>')
  ->setSubject('A test email')
  ->setHtmlBody('<p>Hello world.</p>');

$smtp->send($message);

import (
  "fmt"
  "log"
  "net/smtp"
)

func main() {
  from := "from@example.com"
  to := []string{
    "to@example.com",
  }
  msg := []byte("From: Our Company <from@example.com>\r\n" +
    "To: Test User <to@example.com>\r\n" +
    "Subject: A test email\r\n\r\n" +
    "Hello world.\r\n"
  )

  auth := smtp.CRAMMD5Auth("INBOX_ID@mailosaur.net", "SMTP_PASSWORD")
  err := smtp.SendMail("smtp.mailosaur.net:2525", auth, from, to, msg)
  if err != nil {
    log.Fatal(err)
  }
  fmt.Println("Mail sent successfully!")
}