SMTP is the abbreviation of “Simple Mail Transfer Protocol”. It may be complicated, but the meaning doesn't really matter. All that you need to know is that SMTP is an online tool that allows sending and delivering emails over the internet.

2 parts constitute the email marketing system:

• SMTP service which is the tool that sends emails on the Internet. 
• The Management Application where you control everything like your Email Lists and Marketing. At this place, you can analyse the results to optimise and improve your campaign. 

Free SMTP servers

There are a lot of Free SMTP servers with different features to make your email marketing campaign with paying fees. Let's learn about the top 5 Free SMTP servers providers:

1. SendinBlue

The top free SMTP server provider for me is Sendinblue. They offer an effective SMTP server that supports API, Plugins, and Integrations. If you are working with WordPress, integrating SendinBlue with your website can be done with a few clicks. 

Besides their free service that lets you send 9000 emails per month, they also offer Lite, Essential, Premium, etc… starting from $66/month. 

You can also customize a plan that suits your needs. 

2. Pepipost

Among all SMTP service providers, Pepipost is known for its fastest delivery. They deliver emails to people around the world in seconds due to their servers which are located all

around the globe. 

After signing up, you can start your free email marketing campaigns with 30,000 emails in the first 30 days. Then, you can send 100 free emails only per day. 

If this is not enough for you, you can upgrade to the first plan which costs only 17.5$ per month, and it allows you to send 150,000 emails a month 

3. Pabbly

Can you imagine sending bulk emails to all your email lists in one click? That's Pabbly's strength. This affordable SMTP service provider is one of the best Email Marketing tools because it allows you to integrate more than 50 external SMTPs with no fees. It also takes care of problems like bounce and spam complaints. 

You can start using Bubbly by sending unlimited emails to 100 subscribers for the first 15 days only for free. If you wanna upgrade, you can choose between the plans according to the number of your subscribers. 

Rookie plan: $29/month. 

Pro plan: $49/month 

4. Elastic Emails

Whether you are an affiliate, developer, designer, etc… You would find Elastic Email a very useful platform that offers an ultra-fast global infrastructure for transactional emails. This free SMTP service provider is fast, easy and affordable for everyone due to its great plans. 

They have a free plan that provides 3,000 emails/month for free. 

For paid plans, you can either pay per subscriber ($15 monthly per 5000 contacts and unlimited emails) or you can pay $0.10 per 1000 email and an additional daily fee of $ 0.04. 

5- Postal

Postal is another amazing SMTP email server used by website and web servers. It has a lot of features and integrations that make it easy to use it for your email marketing campaigns. They also have a free plan with few requirements, so you can start your email marketing soon. 

You can read about the Free SMTP Server Setup with Postal (Step by Step Guide) to see how to use this SMTP for free.