Mailtrap Blog: The Best Content About Emails

Top Email Sending and Testing Resources

This is a symbolic graphic representation of reply.io and it's features for an article that covers the topic in detail.

Reply.io Review 2026: Features, Pricing, Verdict

On May 28, 2026

9min read

Key takeaways: Sales outreach in 2026 looks nothing like it did three years ago. Inboxes are noisier, prospects are pickier, […]

Eugene Suslov

Head of Content at Reply

10 Onboarding Email Templates

On May 19, 2026

10min read

Choose the most suitable out of 10 ready-made onboarding email templates or learn how to write an effective custom onboarding email, test, and send it.

Richa Gupta

Outreach Specialist @ uSERP

GDPR Compliance for Email Marketing in 5 Steps

On May 15, 2026

9min read

GDPR lays out the principles of personal data protection. We collected and answered the top 11 questions about how GDPR affects email marketing

Irina Maltseva

Growth Lead @ Aura

How to Combine Social Media and Email Marketing for Maximum Reach

On May 14, 2026

5min read

Learn 10 actionable ways to integrate social media and email marketing to amplify your brand voice.

Afirah Shaikh

Content Marketer @ Social Champ

6 Best Email APIs for AI Agents Tested & Compared: Here’s What I Found

On May 13, 2026

21min read

Find out which email APIs for AI agents give you the most advanced features and have the best email/price ratio!

Ivan Djuric

Technical Content Writer @Mailtrap

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

On May 04, 2026

20min read

We compared 11 B2B email marketing software on email deliverability, email personalization, automations, integrations, and more. Click here.

Yevhenii Odyntsov

Content @Mailtrap

Load More Posts

How to Combine Social Media and Email Marketing for Maximum Reach

On May 14, 2026

5min read

Learn 10 actionable ways to integrate social media and email marketing to amplify your brand voice.

Afirah Shaikh

Content Marketer @ Social Champ

6 Best Email APIs for AI Agents Tested & Compared: Here’s What I Found

On May 13, 2026

21min read

Find out which email APIs for AI agents give you the most advanced features and have the best email/price ratio!

Ivan Djuric

Technical Content Writer @Mailtrap

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

On March 11, 2026

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

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

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

Load More Posts

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

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

Load More Posts

6 Best Email APIs for AI Agents Tested & Compared: Here’s What I Found

On May 13, 2026

21min read

Find out which email APIs for AI agents give you the most advanced features and have the best email/price ratio!

Ivan Djuric

Technical Content Writer @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

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

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

10 Onboarding Email Templates

On May 19, 2026

10min read

Choose the most suitable out of 10 ready-made onboarding email templates or learn how to write an effective custom onboarding email, test, and send it.

Richa Gupta

Outreach Specialist @ uSERP

How to Combine Social Media and Email Marketing for Maximum Reach

On May 14, 2026

5min read

Learn 10 actionable ways to integrate social media and email marketing to amplify your brand voice.

Afirah Shaikh

Content Marketer @ Social Champ

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

On May 04, 2026

20min read

We compared 11 B2B email marketing software on email deliverability, email personalization, automations, integrations, and more. Click here.

Yevhenii Odyntsov

Content @Mailtrap

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

15min 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

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

Load More Posts

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

Load More Posts

Blog

Reply.io Review 2026: Features, Pricing, Verdict

10 Onboarding Email Templates

GDPR Compliance for Email Marketing in 5 Steps

How to Combine Social Media and Email Marketing for Maximum Reach

6 Best Email APIs for AI Agents Tested & Compared: Here’s What I Found

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

How to Combine Social Media and Email Marketing for Maximum Reach

6 Best Email APIs for AI Agents Tested & Compared: Here’s What I Found

I Compared 7 Best Transactional Email Services: 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

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

6 Best Email APIs for AI Agents Tested & Compared: Here’s What I Found

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

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

10 Onboarding Email Templates

How to Combine Social Media and Email Marketing for Maximum Reach

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

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

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

Slack Email Integration: Sending and Receiving Emails

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

Your email workflows deserve more love