You will find a lot of free SMTP servers out there, but few of them are reliable and secure. This is the reason we bring you the list of 10 best free SMTP server that are simple, secured and reliable (well).

If you’re a small business owner, chances are you’ve already heard of the popular, free email service “Gmail” and the need for a reliable, secure SMTP server to send and receive all your email. Luckily for you, we’ve gathered up a list of 10 free SMTP servers that are suitable for small businesses. There are also plenty of other free SMTP servers available for you to choose from, but these are the best.

SMTP stands for Simple Mail Transfer Protocol and is a communication protocol for sending messages electronically. SMTP was first developed in the early 1970s. Simply put, it is software that allows you to send emails over the Internet. Through a storage and routing process, SMTP moves email between different networks. SMTP does this work at every stage.

What is an SMTP relay server?

SMTP relay is used when we want to send mass emails through a trusted third party. Normally there is a limit to the number of messages that can be sent per day, but with an SMTP relay server you can send large emails. SMTP relay works in the cloud, not in your own data centre. An SMTP server is an application whose main purpose is to send, receive or forward outgoing e-mail between senders and recipients.

Why do I need a free scalable SMTP relay server?

SMTP is very important. Without an SMTP server, the email will not reach its destination. Once you click send, the email is converted into a line of code and sent to the SMTP server. The SMTP server then processes the code and sends the message.

Sending peer-to-peer emails is much easier, and it will be very difficult to send mass emails in the same way as peer-to-peer emails. There is also a daily limit to the number of messages you can send and receive. Therefore, in these cases of mass emailing, we need help to ensure that the messages are not considered spam. SMTP helps the user in this situation.

As the business grows, so does the need to send masses of emails, and outsourcing an SMTP relay server is a common practice to keep things running smoothly. Most email senders use the SMTP protocol to send bulk messages. In addition, marketing automation can be used to create rich, responsive marketing campaigns that increase subscriber engagement.

The 10 best free SMTP servers for 2021

Nowadays, many servers are used for sending mass emails. Below is a list of 10 free SMTP servers and their features.

1. Pepipost

Pepipost is the most reliable and secure email delivery service in the world. Bulk messages can be sent with Pepipost by configuring the SMTP in the applications used. Pepipost is the only ESP that does not charge for opened emails. It has about 50,000 customers.

They offer their services 24 hours a day and anyone can contact them at any time for any problem. One of their interesting features is that they are very affordable. Features of pep post include automatic error notification, open tracking, real-time status monitoring, real-time notifications, real-time reports, customizable dashboard.

2. Pabbly email marketing

Pabbly Email Marketing is another SMTP server that excels in fair delivery and availability, as well as reliability. With Pabbly Email Marketing you can easily create, send and analyze email marketing campaigns. Pabbly allows you to track not only the specific results of email marketing, but also the effectiveness of each campaign.

This option also allows you to create and send your own emails. Benefits of Pabbly email marketing: easy to start, easy to measure, easy to share, low cost, reach a global audience. You can send messages automatically after a predetermined time.

3. Mosend

Moosend is a leading provider of email services. It is a European email marketing service provider based in London and Athens. You’ll design and code custom email templates and landing pages for marketing campaigns that guarantee quality. It is a very powerful email marketing platform with great features and a premium user interface.

Moosend’s features include a range of customizable email templates where users can tailor each element to their brand, real-time analytics, drag-and-drop email editor, responsive newsletter templates, email marketing automation, email list segmentation and easy email campaign management.

4. SendGrid

SendGrid is the best cloud-based platform for sending emails. It serves approximately 18 billion customers worldwide. It is a combination of deliverability, scalability and reliability in email management. SendGrid is able to efficiently send a large number of emails at once. The application can send 4,190 emails per second.

Other important features of SendGrid are: Email template engine, reputation monitoring, ISP monitoring, spam filter testing, custom API integration, unsubscribe tracking, dedicated and multiple IP addresses.


SMTP2GO is an SMTP service provider for sending mass transactions and marketing messages worldwide. It is a highly scalable and reliable platform for email delivery services. It supports all authentication and security methods used by the most common email clients.

Allows you to quickly send messages and view message delivery reports. Key features include bounce and spam tracking, live chat, feedback loops, blacklist monitoring, real-time analytics, weekly statements, personalization wizard, spam trace detection and ticket support.

6. SendinBlue

SendinBlue was founded in 2007 and is headquartered in Paris. SendinBlue is a cloud-based email marketing software for the communications industry. SendinBlue is highly scalable and reliable, and has approximately 90,000 users worldwide.

It is a solution for relationship marketing. The menu is easy to navigate and the interface is very user friendly. It offers a drag and drop email editor. It offers excellent deliverability and other features like 24/7 customer support via email and phone, customizable signup forms, and marketing automation.

7. Amazon SES

Amazon Simple Email Service (SES) is a cost-effective, flexible and scalable email service that allows you to send email in bulk. With Amazon SES, you can send marketing and transactional messages or high value content to your customers.

Amazon SES has a high deliverability and is very cost effective. Amazon SES uses configuration sets to create rules that apply to emails sent by the system. Other key features of Amazon SES include content customization, its own IP address, flexible messaging options and integration with AWS. It is a very reliable platform to send large emails without any problems.

8. Mandrill app

The Mandrill application is a platform for sending emails. It is intended solely for the processing of transactional emails. It is a safe and reliable application for sending emails. The Mandrill application allows to quickly send personalized transactional emails. Mandrill is a versatile mail carrier, but it uses its own server to send email.

9. Mailjet

Mailjet is a collective messaging solution for creating, sending and tracking marketing emails, transactional emails and SMS. The company was founded in 2010 and is based in Paris. It helps you create email templates that are tailored to your needs and brands.

Using a market-leading drag-and-drop editor, they create email newsletters. They meet your email and SMS needs with simple and powerful services. Mailjet’s features include unlimited contacts, delivery optimization, individual personalization, delivery and an analytics dashboard.

10. Transmitter pulse

SendPulse helps marketers and developers send emails via SMTP. This platform offers 24/7 customer support, fast delivery, short reports on openings and cancellations.

It is a cloud-based email platform. The main features of SendPulse are A/B testing, email monitoring, list management, reporting/analysis and template management.


This article presents a list of 10 free SMTP servers you can use in 2021. I hope this article has been helpful to you. We wish you a good correspondence!

Frequently Asked Questions

Is there a free SMTP server?

Yes, there are many free SMTP servers.

Where can I get a free SMTP server?

There are many free SMTP servers available on the internet.

How do I create a free SMTP server?

You can create a free SMTP server by using the following command: openssl s_client -starttls smtp -connect This will start an SSL connection to the SMTP server on port 25 and send a STARTTLS command to initiate the TLS negotiation process.

Feedback,free smtp server without authenticationunlimited smtp server freefree smtp server for testinggoogle free smtp serverbest smtp serversimple smtp server,People also search for,Privacy settings,How Search works,google free smtp server,free smtp server port 25 without authentication,free smtp server list with username and password,simple smtp server,online smtp server,free smtp relay software,open source smtp server,sendinblue smtp

You May Also Like

PandaVPN not working (7 tested methods)

Vlad ConstantinescuVPN expert and privacy advocate PandaVPN is a VPN tool that…

Google Play Services Missing in Emulator (Android 4.4.2) –

Development issue/problem: For the emulator I have below, I get an error…

LEGO Launches 2-Player Luigi Starter Course With LEGO Mario And LEGO Luigi

The people at LEGO thought it was a good idea to release…

How to install Google Play app in Android Studio emulator? –

Development issue/problem: I’m completely new to Android Studio and I’m trying to…