Mailtrap Blog: The Best Content About Emails

Top Email Sending and Testing Resources

This is a symbolic graphic representation of the benefits of refer a friend email templates for an article that covers the topic in detail.

Refer a Friend Email Templates: For Business and HR [2025]

On September 18, 2025

8min read

Check out the best refer a friend email templates for your business referral program or to the HR department.

Rohovnin Oleksandr

Copywriter @Phonexa

This is a symbolic graphic representation of data-driven email marketing for an article that covers the topic in detail

Data-Driven Email Marketing: A Go-to Guide for Beginners

On September 15, 2025

17min read

Learn what data-driven email marketing is, how to collect data and run data-driven email marketing campaigns.

Veljko Ristić

Content Manager @Mailtrap

Email Deliverability Issues: How to Diagnose, Fix, and Prevent Them

On August 28, 2025

20min read

Face your email deliverability issues head on and ensure your emails land where they're supposed to: main recipients' inboxes!

Tomasz Chwesewicz

Technical Content Writer @Mailtrap

+1 more author

9 Best Free Email Marketing Platforms Compared: Find Out Which One You Should Try

On August 26, 2025

20min read

We compared the best free email marketing platforms out there so you don't have to! Find out which ones made the cut!

Ivan Djuric

Technical Content Writer @Mailtrap

How to Send Emails in Bun.js: SMTP & Email API Methods Explained

On August 25, 2025

9min read

Start sending emails from your Bun.js project in a few steps with Mailtrap SMTP or email API.

Artem Litvinenko

Software Engineer

+1 more author

Email Deliverability Revenue

On August 19, 2025

9min read

Learn how to calculate email deliverability revenue, what affects it, and find out deliverability practices recommended by our experts!

Yaroslav Hurchenko

Email Deliverability Expert @Mailtrap

+1 more author

Load More Posts

How to Send Emails in Bun.js: SMTP & Email API Methods Explained

On August 25, 2025

9min read

Start sending emails from your Bun.js project in a few steps with Mailtrap SMTP or email API.

Artem Litvinenko

Software Engineer

+1 more author

SMTP vs Email API Explained & Compared: Find Out What Method Developers Should Use

On August 01, 2025

11min read

I compared SMTP vs email API on performance, features, integration, and use cases for developers. Find out the best solution for your project.

Yevhenii Odyntsov

Content @Mailtrap

6 Best Email API Services For Developers Tested & Compared: Here’s What I Found

On July 28, 2025

22min read

Check out our list of 6 best email APIs for developers and choose the best option according to your specific requirements and needs.

Ivan Djuric

Technical Content Writer @Mailtrap

How to Send Emails with Email API: Practical Examples in Popular Languages and Frameworks

On July 23, 2025

11min read

Follow our step-by-step guide and send emails via Mailtrap email API and ready-made libraries for PHP, Laravel, Python, Node.js.

Denys Kontorskyy

Technical Content Writer @Mailtrap

+1 more author

Send Emails in Django: A Developer’s Tutorial to SMTP & Email API Methods

On July 23, 2025

15min read

A guide on how to send emails from a Django app in the most efficient way. Check out different functions and packages to streamline your email.

Dmitriy Shcherbakan

Full Stack Developer @Railsware

+1 more author

EmailJS React: How to Send Emails From a Contact Form Without a Backend

On July 07, 2025

11min read

In this EmailJS React tutorial, I will show you how to send emails from your React contact form or app.

Artem Litvinenko

Software Engineer

+1 more author

Load More Posts

This is a featured image for blog post on subject line testers

6 Subject Line Testers Tried & Compared: Here’s What I Found

On May 30, 2025

9min read

I’ve compared 5 subject line testers based on quality of results, ease of use, price, features, and more - find out what works best for you.

Yevhenii Odyntsov

Content @Mailtrap

How to Test Email Deliverability: Process & Toolkit Explained

On March 24, 2025

12min read

Poor deliverability can cause some serious problems. Luckily, there are various free and paid tools for testing emails.

Piotr Malek

Technical Content Writer @ Mailtrap

+1 more author

This is a graphic representation of an email blacklist, for an article that covers the topic in detail.

Email Blacklists Explained: Causes, Solutions, Prevention

On January 24, 2025

9min read

Find out what an email blacklist is, how it works, what are the reasons to get blacklisted, and how to get off the blacklist and avoid it in the future.

Dzenana Kajtaz

Technical Content Writer @Mailtrap

Email Client Testing Explained

On September 02, 2024

11min read

Learn how to test emails in different email clients using Email Sandbox, Litmus, Email on Acid, and more.

Diana Lepilkina

Content Specialist @Mailtrap

+1 more author

SMTP Server for Testing: Cloud-based or Local?

On August 27, 2024

5min read

How would you approach choosing an SMTP server for testing? Find the key factors to consider in this blog post.

Yevhenii Odyntsov

Content @Mailtrap

How to Automate Email Verification in Selenium

On August 09, 2024

9min read

Selenium can be a great tool for testing your email verification process. We describe how to set everything up in a few simple steps.

Aleksandr Varnin

Full Stack Developer @ Railsware

Load More Posts

What is an Email API?

On July 23, 2025

10min read

Learn what an email API is, how to use it, and why you need it for both side and major projects, all in this article.

Dzenana Kajtaz

Technical Content Writer @Mailtrap

ESP Migration Guide for SaaS and Product-Based Companies

On July 07, 2025

9min read

A step-by-step tutorial on ESP migration: learn how to change an email service provider without hurting email deliverability.

Daria Roshchyna

Technical Content Writer @Mailtrap

This is a featured image for an article on IP pools

What Are Email IP Pools and Why Should You Use Them for Higher Email Deliverability

On June 20, 2025

10min read

Find out what email IP pools are, and master why, when, and how to use them to improve your email deliverability.

Dzenana Kajtaz

Technical Content Writer @Mailtrap

+1 more author

How to Choose Email Service Provider: Actionable Q&A Guide

On May 15, 2025

13min read

Learn how to choose an email service provider: breakdown of choosing criteria and tutorial on how to approach the selection. Click here.

Yevhenii Odyntsov

Content @Mailtrap

SMTP Providers Compared: Choose the Best One for Sending Transactional and Marketing Emails

On April 30, 2025

12min read

We compared 7 SMTP providers to find the best option for sending transactional and marketing emails. You can see the results here.

Denys Velykozhon

Marketing Lead @Railsware

+1 more author

This is a symbolic graphic representation of AI email personalization for an article that covers the topic indetail.

AI Email Personalization: Examples, Benefits, and Best Practices

On March 11, 2025

7min read

AI email personalization helps you to send tailored messages at scale, increasing conversions and generating customer insights. Here's how to use it.

Cohere

Load More Posts

HTML Character Entities: NBSP and HTML Spaces Explained

On February 04, 2025

10min read

&nbsp, or non-breaking space, is an HTML character used to create a space. We analyze when to use it and when to opt for other solutions.

Ivan Djuric

Technical Content Writer @Mailtrap

+1 more author

This image is a symbolic graphic representation of building HTML email template for an article that covers it in detail.

Responsive HTML Email Template Development: A Step-by-Step Guide for Email Developers

On December 20, 2024

8min read

Learn how to develop a custom responsive HTML email template from scratch that renders perfectly in every email client.

Veljko Ristić

Content Manager @Mailtrap

This image is a graphic representation of html vs plain text emails for an article that covers the topic in detail.

HTML vs Plain Text Email: What to Choose For Your Next Email Campaign?

On July 30, 2024

8min read

HTML vs plain text emails compared on performance, deliverability, ROI, and more! Click here to learn the details and decide on your next email campaign.

Veljko Ristić

Content Manager @Mailtrap

This image is a graphic representation of HTML email for an article that covers the topic in detail

HTML Email: A Complete Tutorial for Email Marketers, Designers, and Developers

On July 10, 2024

20min read

Learn what HTML email is, how to create HTML email from scratch or using templates and builders, best practices, and role of HTML in email deliverability.

Veljko Ristić

Content Manager @Mailtrap

Complete Tutorial on Mailto Links: What They Are & How to Use Them

On June 13, 2024

7min read

You can customize mailto links in many ways. We describe them all, give examples, and discuss whether mailto is the right approach.

Yevhenii Odyntsov

Content @Mailtrap

Here’s How You Add an Animated GIF to Your Email Signature

On May 25, 2024

7min read

Looking for ways to make your emails pop? This guide will show you how to add an animated GIF to your email signature.

Yevhenii Odyntsov

Content @Mailtrap

Load More Posts

Data-Driven Email Marketing: A Go-to Guide for Beginners

On September 15, 2025

17min read

Learn what data-driven email marketing is, how to collect data and run data-driven email marketing campaigns.

Veljko Ristić

Content Manager @Mailtrap

9 Best Free Email Marketing Platforms Compared: Find Out Which One You Should Try

On August 26, 2025

20min read

We compared the best free email marketing platforms out there so you don't have to! Find out which ones made the cut!

Ivan Djuric

Technical Content Writer @Mailtrap

This is a symbolic graphic representation of email marketing optimiztion for an article that covers the topic in detail.

7 Proven Email Marketing Optimization Strategies

On July 29, 2025

10min read

Learn 7 best data-driven strategies and tactics for email marketing optimization to improve your email campaigns right now.

Yevhenii Odyntsov

Content @Mailtrap

This is a symbolic graphic representation of best email marketing examples for an article that covers the topic in detail.

10 Tried-and-Tested Email Marketing Examples That Convert (+1 Smart Bonus)

On July 29, 2025

15min read

I’ve collected and analyzed 11 best email marketing examples: find out actionable insights to improve your own email marketing campaigns.

Oleksii Ianchuk

Product Lead @ Mailtrap

Symbolic graphic representation of email marketing tips for an article that covers the topic in detail.

8 Best Marketing Tips: Personal Insights for Improving Email Campaigns

On July 25, 2025

14min read

I’ve prepared 8 best email marketing tips based on personal experience. Try them now to improve email marketing campaigns immediately.

Oleksii Ianchuk

Product Lead @ Mailtrap

Email marketing strategy displayed as a map

How to Creat Email Marketing Strategy & An Overview of Ready-to-Use Strategies

On July 03, 2025

20min read

Learn how to create an email marketing strategy and find a list of proven ready-to-use email marketing strategies.

Ketevan Bostoganashvili

Technical Content Writer @Mailtrap

+1 more author

Load More Posts

Let Your AI Agent Send Emails: Mailtrap MCP Server is Now Live!

On April 26, 2025

1min read

Find out what Mailtrap's very own MCP server can do if you leverage it with your AI IDE or personal AI assistant!

Ivan Djuric

Technical Content Writer @Mailtrap

Now You Can Send Targeted Campaigns with Mailtrap Contacts

On October 21, 2024

1min read

You can now use Mailtrap Contacts & Lists to organize your contacts into lists and send targeted campaigns. Learn more here.

Ketevan Bostoganashvili

Technical Content Writer @Mailtrap

New email templates with drag and drop builder

Improved Templates with Drag-and-Drop Editor, Simplified Integration Flow, and More

On July 03, 2024

2min read

Mailtrap extends Templates features with a new visual builder, easier integrations, and more. Learn what’s new here.

Ketevan Bostoganashvili

Technical Content Writer @Mailtrap

Mailtrap robot holds a certificate to indicate Mailtrap acquiring ISO certification

Mailtrap Is Now ISO Certified

On April 10, 2024

2min read

Mailtrap can now certify that we handle all the development processes in accordance with ISO standards. Learn what this means in this article.

Ketevan Bostoganashvili

Technical Content Writer @Mailtrap

Now Mailtrap Customers Can Test Email Templates via API

On March 26, 2024

2min read

We’ve introduced Email Testing API for Email Templates. Learn what this means and get all the information about its benefits here.

Ketevan Bostoganashvili

Technical Content Writer @Mailtrap

Using Handlebars with Mailtrap Email Templates | Quick Guide with Examples

On February 14, 2023

6min read

Need to add some helpers to your email templates? Learn how to use Handlebars with Mailtrap to customize your emails.

Veljko Ristić

Content Manager @Mailtrap

Load More Posts

Blog

Refer a Friend Email Templates: For Business and HR [2025]

Data-Driven Email Marketing: A Go-to Guide for Beginners

Email Deliverability Issues: How to Diagnose, Fix, and Prevent Them

9 Best Free Email Marketing Platforms Compared: Find Out Which One You Should Try

How to Send Emails in Bun.js: SMTP & Email API Methods Explained

Email Deliverability Revenue

How to Send Emails in Bun.js: SMTP & Email API Methods Explained

SMTP vs Email API Explained & Compared: Find Out What Method Developers Should Use

6 Best Email API Services For Developers Tested & Compared: Here’s What I Found

How to Send Emails with Email API: Practical Examples in Popular Languages and Frameworks

Send Emails in Django: A Developer’s Tutorial to SMTP & Email API Methods

EmailJS React: How to Send Emails From a Contact Form Without a Backend

6 Subject Line Testers Tried & Compared: Here’s What I Found

How to Test Email Deliverability: Process & Toolkit Explained

Email Blacklists Explained: Causes, Solutions, Prevention

Email Client Testing Explained

SMTP Server for Testing: Cloud-based or Local?

How to Automate Email Verification in Selenium

What is an Email API?

ESP Migration Guide for SaaS and Product-Based Companies

What Are Email IP Pools and Why Should You Use Them for Higher Email Deliverability

How to Choose Email Service Provider: Actionable Q&A Guide

SMTP Providers Compared: Choose the Best One for Sending Transactional and Marketing Emails

AI Email Personalization: Examples, Benefits, and Best Practices

HTML Character Entities: NBSP and HTML Spaces Explained

Responsive HTML Email Template Development: A Step-by-Step Guide for Email Developers

HTML vs Plain Text Email: What to Choose For Your Next Email Campaign?

HTML Email: A Complete Tutorial for Email Marketers, Designers, and Developers

Complete Tutorial on Mailto Links: What They Are & How to Use Them

Here’s How You Add an Animated GIF to Your Email Signature

Data-Driven Email Marketing: A Go-to Guide for Beginners

9 Best Free Email Marketing Platforms Compared: Find Out Which One You Should Try

7 Proven Email Marketing Optimization Strategies

10 Tried-and-Tested Email Marketing Examples That Convert (+1 Smart Bonus)

8 Best Marketing Tips: Personal Insights for Improving Email Campaigns

How to Creat Email Marketing Strategy & An Overview of Ready-to-Use Strategies

Let Your AI Agent Send Emails: Mailtrap MCP Server is Now Live!

Now You Can Send Targeted Campaigns with Mailtrap Contacts

Improved Templates with Drag-and-Drop Editor, Simplified Integration Flow, and More

Mailtrap Is Now ISO Certified

Now Mailtrap Customers Can Test Email Templates via API

Using Handlebars with Mailtrap Email Templates | Quick Guide with Examples

Your email workflows deserve more love