Top SMTP Service Providers for Enterprises

Have you ever heard about the SMTP server? Or do you know about SMTP service? If this is a new word for you, then it will not be new for a longer period.

In this article, we are going to introduce you to SMTP server service and tell you the best SMTP service providers that are providing you the best SMTP features and offering you amazing services.

We will discuss the following topics in this article below:

  • What is SMTP Service?
  • How SMTP Works?
  • What is SMTP Relay Service?
  • Best SMTP Service Providers
  • Conclusion

What is an SMTP Service?

SMTP stands for Simple Mail Transfer Protocol. Its main purpose is to send,  receive, and relay email between sender and receiver of the email.

An SMTP server uses an address to perform its task, for example it’s an SMTP address is like

If you are using a GMail server, then the SMTP email service address of GMail is

When you send an email to someone, then it goes through your SMTP server and checks for the SMTP server of the receiver, and then send it to the receiver.

How SMTP Server Works?

Let’s discuss in detail how SMTP mail service works and what are the steps to perform when you hit the “Send Email from your system.

So, here are the steps below:

  1. When you click on the Sent email button, then your message will be sent to your SMTP server.
  2. Then, the next step is that your SMTP checks the availability of the internet, and if it is connected then it moves further.
  3. Now, if the receiver has a different smtp server, suppose you are using an GMail server and the receiver is using Yahoo server, then SMTP server will check if it is connected to the server or not, if it is, then it directly sends your message to the receiver. But if it is not connected, then your server hands over your message to the other incoming server near to the receiver’s server.
  4. But what in case if the server is down or busy? In this case, the SMTP server drops your message to the backup server and puts it in queue for a limited period. When the time exceeds, the mail drops a message to the sender, that the mail is not sent.

What is SMTP Relay Service?

The SMTP Relay service is a protocol that is used to transfer email through the internet. 

The only task of SMTP Relay service is to receive the mail from the sender and deliver it to the receiver’s SMTP server. You can also say it as a mail relaying service.

Best SMTP Service Providers For Small And Business Enterprises

Here we are going to know what are the best email SMTP service providers that are offering you amazing services and features for your emails.

Here are a few best SMTP service providers that we can recommend to you:

  • SendGrid
  • MailGun

Now, let’s see what are the features and services they are serving us. You can also choose various SMTP servers like DuoCircle SMTP.


SendGrid is another best SMTP service provider that provides you different plans for SMTP services, even it also provides you a free plan where you are provided with limited features.

The very first plan of SendGrid starts from $14.95 per month.

Features and Services:

  • Link Branding
  • Reverse DNS
  • Universal Links
  • Real-Time Analytics
  • SMTP and API
  • Technical Support
  • Knowledge Center
  • Mail Transfer Agent (MTA)
  • Email Address Validation API
  • Dedicated IP Address
  • Advanced Statistics


MailGun SMTP is an SMTP service provider that provides various online security solutions to protect your information and data from cybercrimes.

It also offers you a free plan where you are provided with basic and limited features. 

MailGun starts serving its products at $35 per month.

Features of MailGun:

  • Dedicated IP
  • Dedicated IP Pools
  • 99.99% SLAs Uptime Guarantee
  • Inbound Email Routing
  • Suppression Management
  • Send Time Optimization
  • 30 Days Log Retention
  • Detailed Documentation, and many more…

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Now you know what SMTP service is and how it works. We also discuss the best two SMTP service providers in this article. 

We hope you find this article helpful and informative. If you like this article, then show your love in the comments section below.

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John Peter

John is a professional technology blogger who has been doing blogging for the last 5 years. He loves to write & share content about web development, software programming, digital marketing, SEO, social media, tech gadgets, etc.

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