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Top Email Sending and Testing Resources

This is a graphic representation of why email marketing is important for the article that covers the topic in detail.

Find Out Why Email Marketing Is Important: 11 Reasons Why You Should Invest

On February 26, 2026

14min read

Find out 11 reasons why email marketing is important in 2025, backed by real-world examples, and why it's worth your investment.

Yevhenii Odyntsov

Content @Mailtrap

What is an ESP or Email Service Provider? A Beginner’s Guide

On February 05, 2026

8min read

Find out what is an ESP or email service provider, how it differs from an email provider, get a list of popular ESPs, and learn how to choose a suitable provider.

Yevhenii Odyntsov

Content @Mailtrap

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

Cancellation Email: What it is, Examples, and Templates

On February 02, 2026

4min read

Find out everything about cancellation email: what it is, examples and templates to use, and how to write and send your own cancellation emails

Jody Gail Arsolon

Content Writer @maileroo

This is a symbolic graphic representation of best email API for Python developers for an article that covers the topic in detail.

5 Best Email API for Python Developers Tested & Compared

On January 30, 2026

12min read

I compared 5 best email APIs for Python developers on SDK quality, framework compatibility, flexibility, email infrastructure, pricing, and more.

Yevhenii Odyntsov

Content @Mailtrap

10 B2B Email Marketing Software Tried, Tested, and Compared: Find Out The Best Pick for Your Company

On January 27, 2026

18min read

We compared 9 B2B email marketing software on email deliverability, email personalization, automations, integrations, and more. Click here.

Yevhenii Odyntsov

Content @Mailtrap

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

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

On January 20, 2026

10min 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

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5 Best Email API for Python Developers Tested & Compared

On January 30, 2026

12min read

I compared 5 best email APIs for Python developers on SDK quality, framework compatibility, flexibility, email infrastructure, pricing, and more.

Yevhenii Odyntsov

Content @Mailtrap

This is a symbolic graphic representation of WordPress contact forms for an article that covers the topic in detail.

How to Create a WordPress Contact Form: With or Without Plugin, Add Form Validation, and Set Up Email Sending

On January 09, 2026

14min read

Learn how to create and add a WordPress contact form to your website with or without a plugin in our in-depth tutorial.

Veljko Ristić

Content Manager @Mailtrap

This is a featured image for a blog article on sending emails in WordPress

How to Send Emails in WordPress using Plugin, wp_mail() Function, and SMTP

On January 09, 2026

15min read

Learn how to send emails in WordPress: an overview of the options and a guide for each of them like wp_mail() and the SMTP plugin.

Veljko Ristić

Content Manager @Mailtrap

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

On December 19, 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

I Compared 7 Best Transactional Email Services: Here’s What I Found

On December 05, 2025

15min read

Find out which is the best transactional email service provider in %currentyear% based on comparison of deliverability, reliability, scalability, and more.

Ketevan Bostoganashvili

Technical Content Writer @Mailtrap

+1 more author

Salesforce Email Integration: A Comprehensive Guide

On November 25, 2025

5min read

Looking to streamline your business communication? This article provides step-by-step instructions on integrating Salesforce with Outlook and Gmail, enhancing your CRM processes, and uncovering the potential benefits and limitations of each.

Yevhenii Odyntsov

Content @Mailtrap

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

On January 20, 2026

10min 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 Send Emails in WordPress using Plugin, wp_mail() Function, and SMTP

On January 09, 2026

15min read

Learn how to send emails in WordPress: an overview of the options and a guide for each of them like wp_mail() and the SMTP plugin.

Veljko Ristić

Content Manager @Mailtrap

This is a cover image for an article that goes over in detail how to test emails in WooCommerce

How to Test Your WooCommerce Emails: Insights and Obstacles to Overcome

On December 09, 2025

4min read

Learn how to test your WooCommerce emails to ensure they display correctly, delivered reliably and error free.

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

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What is an ESP or Email Service Provider? A Beginner’s Guide

On February 05, 2026

8min read

Find out what is an ESP or email service provider, how it differs from an email provider, get a list of popular ESPs, and learn how to choose a suitable provider.

Yevhenii Odyntsov

Content @Mailtrap

5 Best Email API for Python Developers Tested & Compared

On January 30, 2026

12min read

I compared 5 best email APIs for Python developers on SDK quality, framework compatibility, flexibility, email infrastructure, pricing, and more.

Yevhenii Odyntsov

Content @Mailtrap

How to Configure WordPress SMTP Settings

On January 09, 2026

9min read

Learn how to set up WordPress SMTP to send transactional or marketing emails using PHPMailer or an SMTP plugin.

Yevhenii Odyntsov

Content @Mailtrap

Best 8 WordPress Transactional Email Plugins Reviewed

On January 09, 2026

9min read

We've picked eight great plugins for sending transactional emails in WordPress. Learn more about their features, integration options, and price tags.

Yevhenii Odyntsov

Content @Mailtrap

BIMI: the New Word in Email Authentication

On December 19, 2025

7min read

BIMI authentication is a brand new weapon against spoofing. Are you curious about how it works? We’ve got everything covered for you.

Oleksii Ianchuk

Product Lead @ Mailtrap

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

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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

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Find Out Why Email Marketing Is Important: 11 Reasons Why You Should Invest

On February 26, 2026

14min read

Find out 11 reasons why email marketing is important in 2025, backed by real-world examples, and why it's worth your investment.

Yevhenii Odyntsov

Content @Mailtrap

10 B2B Email Marketing Software Tried, Tested, and Compared: Find Out The Best Pick for Your Company

On January 27, 2026

18min read

We compared 9 B2B email marketing software on email deliverability, email personalization, automations, integrations, and more. Click here.

Yevhenii Odyntsov

Content @Mailtrap

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

How to Track Email Campaign Performance: 9 Best Email Marketing Dashboards to Use

On November 10, 2025

10min read

Discover the 9 best email marketing dashboards to monitor email KPIs, optimize campaigns, and automate insights.

Nadia Basaraba

Marketing Specialist @Coupler.io

Slack Email Integration: Sending and Receiving Emails

On November 10, 2025

6min read

Slack can be easily integrated with email clients for both sending and receiving emails. We explore many different approaches.

Yevhenii Odyntsov

Content @Mailtrap

Email Marketing For An Agency: A Go-To Guide For Beginners

On October 29, 2025

15min read

Learn how to get your email marketing for agencies up and running: best practices, hidden pitfalls, examples. Ideal for agencies’ founders and CMOs.

Oleksii Ianchuk

Product Lead @ Mailtrap

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.

Oleksii Ianchuk

Product Lead @ Mailtrap

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API for Email Sending Stats: Track the Performance of Your Emails Directly from Your App/Project

On December 22, 2025

2min read

Learn more about Mailtrap's Email Sending Stats API, which lets you retrieve the stats of your sent emails without opening the UI.

Ivan Djuric

Technical Content Writer @Mailtrap

Manage Setups with Multiple Teams with Organization and Sub-Accounts

On October 07, 2025

1min read

Learn how to use Mailtrap’s latest feature to manage multiple accounts under a single organization, separate resources, streamline billing and permissions, and more.

Ivan Djuric

Technical Content Writer @Mailtrap

Mailtrap Releases Automations: Build Email Sequences Using Visual Blocks

On September 18, 2025

2min read

Find out all about latest feature: Automations. With it, you can build email sequences and workflows directly in Mailtrap's visual builder, no coding required!

Ivan Djuric

Technical Content Writer @Mailtrap

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

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Blog

Find Out Why Email Marketing Is Important: 11 Reasons Why You Should Invest

What is an ESP or Email Service Provider? A Beginner’s Guide

Cancellation Email: What it is, Examples, and Templates

5 Best Email API for Python Developers Tested & Compared

10 B2B Email Marketing Software Tried, Tested, and Compared: Find Out The Best Pick for Your Company

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

5 Best Email API for Python Developers Tested & Compared

How to Create a WordPress Contact Form: With or Without Plugin, Add Form Validation, and Set Up Email Sending

How to Send Emails in WordPress using Plugin, wp_mail() Function, and SMTP

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

I Compared 7 Best Transactional Email Services: Here’s What I Found

Salesforce Email Integration: A Comprehensive Guide

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

How to Send Emails in WordPress using Plugin, wp_mail() Function, and SMTP

How to Test Your WooCommerce Emails: Insights and Obstacles to Overcome

How to Test Email Deliverability: Process & Toolkit Explained

Email Blacklists Explained: Causes, Solutions, Prevention

Email Client Testing Explained

What is an ESP or Email Service Provider? A Beginner’s Guide

5 Best Email API for Python Developers Tested & Compared

How to Configure WordPress SMTP Settings

Best 8 WordPress Transactional Email Plugins Reviewed

BIMI: the New Word in Email Authentication

What is an Email API?

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

Find Out Why Email Marketing Is Important: 11 Reasons Why You Should Invest

10 B2B Email Marketing Software Tried, Tested, and Compared: Find Out The Best Pick for Your Company

How to Track Email Campaign Performance: 9 Best Email Marketing Dashboards to Use

Slack Email Integration: Sending and Receiving Emails

Email Marketing For An Agency: A Go-To Guide For Beginners

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

API for Email Sending Stats: Track the Performance of Your Emails Directly from Your App/Project

Manage Setups with Multiple Teams with Organization and Sub-Accounts

Mailtrap Releases Automations: Build Email Sequences Using Visual Blocks

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

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