MailHog - Web and API based SMTP testing

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MailHog - Web and API based SMTP testing

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Most of the projects will have a requirement of sending and receiving mails. We have mentioned about GreenMail - Email Test Framework, in our previous article about API based SMTP testing. In this article, we discuss about MailHog - Web and API based SMTP testing. You send out a mail from your code and you can check it via web visually and also via API. Those who do API testing can check via API. Developers may want to visually verify the format of the mail. MailHog is a best bet for SMTP testing.

Git Link: https://github.com/mailhog/MailHog

License: MIT

Language: Go

MailHog is inspired by MailCatcher - A test SMTP server written in Ruby. Its feature include

ESMTP Server with support for SMTP Auth
Web interface to view messages (plain text, HTML or source)
Multipart MIME support
Option to store in-memory of MongoDB

Download the latest release

https://github.com/mailhog/MailHog/blob/master/docs/RELEASES.md

Run the below command to start the server in port 25

CMD > Mailhog -smtp-bind-addr 0.0.0.0:25

Below code is in Java to send out a mail with inline images

public static void sendMail() {

  Properties props = new Properties();
  props.put("mail.transport.protocol", "smtp");
  props.put("mail.smtp.host", "127.0.0.1");
  props.put("mail.smtp.port", "25");

  String htmlContent = "<html> <head> <title></title> </head> <body> "
                                 + "<table align=\"left\"> <tbody> <tr> <td>"
                                 + " <a href=\"https://www.findbestopensource.com/images/findbestopensource-logo.jpg\""
                                 + " target=\"_blank\"" 
                                 + " rel=\"noopener\"><img src=\"https://www.findbestopensource.com/images/findbestopensource-logo.jpg\" width=\"300\"" 
                                 + " height=\"auto\" style=\"display:block\"/></a></td> </tr> <tr><H1> Best open source weekly newsletter. </H1></tr> </tbody> </table></body></html>";

  Session mailSession = Session.getInstance(props, null);
  try {
         MimeMessage msg = new MimeMessage(mailSession);
         msg.setFrom("abcd@example.com");
         msg.setRecipients(Message.RecipientType.TO, "editor@findbestopensource.com");
         msg.setSubject("Best Open Source Newsletter 14");
         msg.setSentDate(new Date());

         MimeMultipart content = new MimeMultipart();
         BodyPart bodyPart = new MimeBodyPart();
         bodyPart.setContent(htmlContent, "text/html; charset=UTF-8");
         //bodyPart.setHeader("Content-Transfer-Encoding", "quoted-printable");

         BodyPart bodyPart1 = new MimeBodyPart();
         bodyPart1.setContent("This is a test news letter", "text/plain; charset=ISO-8859-1");

         content.addBodyPart(bodyPart);
         content.addBodyPart(bodyPart1);
         msg.setContent(content);
         Transport.send(msg);
  } 
  catch (MessagingException e) { 
         e.printStackTrace();
  }
}

You can check visually the message. Launch the browser and access the URL

http://localhost:8025

MailHog message listing

Mailhog message detail view

Using API you can receive the messages in JSON format.

http://localhost:8025/api/v2/messages

MailHog is a great tool for SMTP related testing. We don't need SMTP server or mail client to test the feature. We can manually view the messages and we can also retrieve the messages via API.

Reference:

https://github.com/mailhog/MailHog

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