MailHog - Web and API based SMTP testing

We have collection of more than 1 Million open source products ranging from Enterprise product to small libraries in all platforms. We aggregate information from all open source repositories. Search and find the best for your needs. Check out projects section.

MailHog - Web and API based SMTP testing

We aggregate and tag open source projects. We have collections of more than one million projects. Check out the projects section.

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

Sponsored:
To find embedded technology information about MCU, IoT, AI etc Check out embedkari.com.

Findbestopensource Editorial Team

We publish blog post about open source products. If you are interested in sharing knowledge about open source products, please visit write for us

GreenMail - Email Test Framework in Java

In any project there will be a need to send mail out to users. It could be an alert mail, forget password or authentication related mail. Mail is the default communication between the software and the users. As a developer, we can write code, to send out a mail but we need to make sure whether it got successfully received and how the body of mail, Is it the same like what we have sent. GreenMail is a Email test framework which helps to send and receive mails. It is a test framework which supports SMTP, POP3, IMAP including SSL.

mkcert - No config certificate authority tool

Mkcert is go-lang project, which is super easy tool to setup certificate authority without any configuration. Using certificates are inevitable these days, data should be transferred in a secure communication channel. Buying a certificate is expensive and mostly companies buy certificates only for production systems. In Dev setup, if we use self-signed certificate then there will be trust errors. mkcert automatically creates and installs a local CA in the system root store, and generates locally-trusted certificates.

10 sites to get the large data set or data corpus for free

You may require GBs of data to do performance or load testing. How your app behaves when there is loads of data. You need to know the capacity of your application. This is the frequently asked question from the sales team "The customer is having 100GB of data and he wants to know whether our product will handle this? If so how much RAM / Disk storage required?". This article has pointers to the large data corpus.

Ngnix - High Performance Web Server, Proxy Server, Content Cache and Reverse Proxy

Nginx is a High Performance Web Server, Proxy Server, Content Cache and Reverse Proxy server. It can also be used as mail proxy server and a generic TCP/UDP proxy server. Nginx claims to be more efficient and faster in the Web space compared to the other web servers. This can be evident with the architecture which is based on asynchronous event-driven approach. The event driven architecture enables to scale to hundreds / thousands of concurrent connections.

10 Free services for your Website / Blog. Just plug it.

Each website / blog delivers useful content or service to its users. But website themselves requires some service to monitor and increase its presence. Here are few free services which could be used by Website / Blog. This will be very much helpful for small business owners.

Web based commenting system. Embed directly in to your site

Comments are very important for a blog or website to get feedback from their users. Comments could be threaded where users could be discuss and post reply to the comment. Here we going discuss about the most popular and widely used free commenting system. You need to embed their javascript code in your every page and it will take care the rest of the task.

Top 15 Open source alternative to Microsoft products

Microsoft is monopoly in the commercial software. Here are 15 best alternatives to most popular and widely used Microsoft products.

How to solve CommunicationsException in Java while using Hibernate and MySQL

You might have faced CommunicationsException, basically timeout issue in Java while connecting to MySQL using Hibernate. The session would be timed out after certain period of time. You might be thinking that the your site or application is running without any issue but it would have stopped or crashed due to exception.

Univention Corporate Server - An open source identity management system

Univention Corporate Server is an open source identity management system, an IT infrastructure and device management solution and an extensible platform with a store-like App Center that includes tested third party applications and further UCS components: This is what Univention combines in their main product Univention Corporate Server, a Debian GNU/Linux based enterprise distribution. This article provides you the overview of Univention Corporate Server, its feature and installation.

How to contribute to open source

I could see many many students posting this question in many forums, I want to contribute to open source but How to contribute? There are many ways to do that. I have listed a few and I hope it might be useful.

How to make money from Open Source

As open source getting popular day by day, many have questions like How to make money from Open Source? Lot more products are getting introduced and don't know who is making money. Certainly open source means, give the product and source for free then how to make money? Yes sell the product for free but get paid for its services.

8 Best Open Source Searchengines built on top of Lucene

Lucene is most powerful and widely used Search engine. Here is the list of 7 search engines which is built on top of Lucene. You could imagine how powerful they are.

Exonum Blockchain Framework by the Bitfury Group

Exonum is an extensible open source blockchain framework for building private blockchains which offers outstanding performance, data security, as well as fault tolerance. The framework does not include any business logic, instead, you can develop and add the services that meet your specific needs. Exonum can be used to build various solutions from a document registry to a DevOps facilitation system.

Activiti - Open Source Business Automation

Activiti Cloud is the first Cloud Native BPM framework built to provide a scalable and transparent solution for BPM implementations in cloud environments. The BPM discipline was created to provide a better understanding of how organisations do their work and how this work can be improved in an iterative fashion.

SeoToaster: easy, fast and efficient open source CMS for top SEO performance

SeoToaster is a free Open Source CMS & Ecommerce solution to build, manage and market websites optimized for for top search engine performance. As the name implies, Seo Toaster is to date the only content management system (CMS) to truly integrate SEO execution and web marketing automation technology in full compliance with the search engines industry’s best practices.

LogicalDOC - Open Source DMS

LogicalDOC is both a document management and a collaboration system. The software is loaded with many functions and allows organizing, indexing, retrieving, controlling and distributing important business documents securely and safely for any organization and individual.

AbanteCart - Easy to use open source e-commerce platform, helps selling online

AbanteCart is a free, open source shopping cart that was built by developers with a passion for free and accessible software. Founded in 2010 (launched in 2011), the platform is coded in PHP and supports MySQL. AbanteCart’s easy to use admin and basic layout management tool make this open source solution both easy to use and customizable, depending on the skills of the user. AbanteCart is very user-friendly, it is entirely possible for a user with little to no coding experience to set up and use this cart. If the user would be limited to the themes and features available in base AbanteCart, there is a marketplace where third-party extensions or plugins come to the rescue.

Identicon - Get unique avatar for your website users

Users login in to the Websites, Blogs, Forum and adding their content, comments, asking or answering the questions etc. If user has added his photo then it will get displayed besides his content but not everyone provides his photo image to the sites. Most of the sites used to display a common avatar image for those who have not provided their image. When we read the content, it may be odd to see the same image representation for all users. Identicon comes for the rescue.

LucidWorks Vs SearchBlox - Enterprise Search Solution

Enterprise search software should be capable to search the data available in the entire organization or personnel desktop. The data could be in File system, Web or in Database. It should search contents of Emails, file formats like doc, xls, ppt, pdf and lot more. There are many commercial products available but LucidWorks and SearchBlox are best and free.

LetsEncrypt certificate using ZeroSSL tools

Let’s Encrypt is a free, automated, and open Certificate Authority. It uses ACME protocol to validate your domain. If you have complete control over your domain, you can get a certificate for free. In order to provide secure access to your public network like HTTPS, LDAPS etc you need a certificate from a Certificate Authority. The cost of the certificate range from 10$ to 100$. If you want a wildcard certificate then it may cost more. The certificate is valid for one year and you need to pay and renew every year. Let's Encrypt comes for the rescue. You can create and renew certificate for few.