SMTP Server Communication is an integral part of any civilization. Thanks to fast and efficient communication, the world is turning into a tremendous digital society. Email is an essential part of this communication. It has played a considerable role in the way we communicate. Email is used for both personal and corporate communications. Speaking of business communication, you can split the emails for internal or external communication with your clients, brand, lead generation, etc. To send such a large volume of emails, you need a simple email transfer protocol or SMTP server.

What is SMTP or Modest Mail Transfer Protocol?

SMTP Server_ Definition, Types, Modest Mail Transfer Protocol_

Agreement’s jump by explaining what SMTP is. SMTP stands for Simple Mail Transfer Protocol. It is similar to your net protocol or your IP address, used for the leading communication network. It is part of the TCP / IP application layer. Like CDNs, SMTP works on the Store and Forward concept. It works with your MTA or mail handover manager to get your message to the correct recipient or computer. The MTA is essentially an SMTP server. Click here to find out what an SMTP server is.

SMTP server model

There are two types of SMTP server models:

  • Transfer method
  • Intermediate storage method

The end-to-end model is used for communication between different organizations, while the staging method is used within the organization. An SMTP client was trying to send an email contact the recipient’s SMTP host directly to send the email to the recipient. The SMTP server retains the email until it successfully copied to the recipient’s SMTP address.

The SMTP client is the one that initiates the session, let’s call it the SMTP client, and the SMTP server is the one that responds to the session request, and we call it the SMTP recipient. Therefore,  SMTP client starts the session, and the SMTP recipient responds to the request.

Why use SMTP when you have Gmail / Yahoo / Outlook?

Indeed, most of us use web interfaces like Gmail, Yahoo, Outlook, etc., to send personal and business emails daily. However, we need to understand that these platforms are designed to send manual 1: 1 messages and are not designed to scale.

What do we mean by grading my SMTP server?

When you run an online business, you send thousands of automated emails that are triggered based on user activity on the website, such as sign up, change password, abandon cart, etc. You need this efficient, scalable system, and in this scenario, it is not possible to send emails through the web interface.

Why choose SMTP over API?

As a sender of emails, you often get them confused. SMTP vs. API, what to choose?

Although SMTP the more widely used of the two, there are also some problems with SMTP. SMTP communication problems can avoided using APIs, which tend to have the best delivery speed and can done in seconds. Ultimately, the choice will depend on your messaging needs (automation and tracking metrics) and the platform’s capabilities.

How to send emails using an SMTP server

You can configure your SMTP server or connect your email client to one of the SMTP server providers (cloudy and scalable like Pepipost) and allow direct delivery of emails.

Some of you may think that setting up your SMTP server can cut costs. But when I think about it, it isn’t because each SMTP relay server has certain limits on the number of emails it can send to different ISPs.

Even if you write code to help you scale and send millions of emails, sometimes ISPs block these emails as spam because a large number of emails are sent to only one sender at a time.

Challenges Most Developers Face with SMTP Integration

If you are on a shared introducing server, ports 25 and 587 will remain blocked. Your host voluntarily defined this block. It even applies to some dedicated servers. If these ports blocked, try connecting to port 2525. If you find that this port is also blocked, the only solution to contact your host to unblock these ports.