Mailtrap Blog: The Best Content About Emails

Top Email Sending and Testing Resources

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

On May 06, 2026

19min 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

I Tested 8 Cheap Email Marketing Platforms for Best Price/Value: Here’s What I Found

On May 04, 2026

29min read

Find out which cheap email marketing platforms give you the most advanced features and the best email limit/contacts ratio!

Ivan Djuric

Technical Content Writer @Mailtrap

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

Email throttling: the ultimate guide for technical teams

On April 02, 2026

11min read

Email throttling is what happens when your email provider slows down or blocks your mail sending because you’ve exceeded the email delivery rate. Check out the best practices to handle this issue.

Julia Gulevich

Head of Customer Success @GlockApps

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

8 Best Email Deliverability Agencies Reviewed

On March 31, 2026

13min read

I’ve reviewed 8 best email deliverability agencies on pricing, services, case studies, testimonials, and more.

Veljko Ristić

Content Manager @Mailtrap

This is a symbolic graphic representation of appointment remider templates for an article that covers the topic in detail.

5 Appointment Reminders Templates to Increase Engagement

On March 27, 2026

4min read

Pick and use from 5 best appointment reminders templates to increase your customer engagement and streamline customer service.

Heather Langley

Content Writer @Solvid

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

On May 06, 2026

19min 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

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

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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

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

On May 06, 2026

19min 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

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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

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

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

5 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

I Tested 8 Cheap Email Marketing Platforms for Best Price/Value: Here’s What I Found

Email throttling: the ultimate guide for technical teams

8 Best Email Deliverability Agencies Reviewed

5 Appointment Reminders Templates to Increase Engagement

5 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

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

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

5 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

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

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

Your email workflows deserve more love