Python Sending Email Using Smtp

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Python Sending Email Using Smtp – In this article I will teach you something interesting. I will teach you how to send email!

But don’t get me wrong. I don’t want to teach you how to log into gmail and send a message to your best friend.

Python Sending Email Using Smtp

Python Sending Email Using Smtp

Let’s say this database stores the names of your customers and the products they are interested in based on their previous purchases.

How To Send Emails In Python

Now you want to send each of your customers a personalized email that includes their name and offers a new product they’re interested in.

This programming works because you can programmatically send an email to each of them with a dynamic body. So instead of writing thousands of emails by hand, you just write a few lines of code and you’re good to go.

Rather than rush this and show you the code, it’s a good idea to learn a little theory about how email works first.

It’s actually quite simple. It is a set of rules that govern how two mail servers can talk to each other.

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However, you don’t need to know how SMTP works to send email using python, but it is very valuable.

Python provides you with the smtplib module, which abstracts away all the complexities of SMTP. This module basically implements the SMTP protocol for you. So all you have to do is send an email to this module, sit back, relax and watch smtplib do all the heavy lifting for you.

Before I start talking about this amazingly easy way to send email with Python, I want to start by showing you the code so you can understand how simple, short and easy it is.

Python Sending Email Using Smtp

This code assumes you have python3 and a gmail email account, but the same concepts work for any email service.

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The code represents a client application talking to your email server (running at and asking that server to send an email with the message “this message is from python” to the email address “[email protected]”.

If you take the code I wrote above and try to run it immediately after replacing the login information with your custom information, you will get an error like this.

By default, Gmail tries to secure your email by blocking third-party access. You can manage your gmail security settings by allowing less secure apps by following this link. It is disabled by default, so you need to enable it.

Now listen to me. I recommend not allowing less secure apps to connect to Gmail, as this opens the door to some security attacks.

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Here’s what I want from you: You should only allow untrusted apps to try and test the code, but remember to reset your security settings back to their defaults when you’re done.

With simple security, run the code again with the correct login details and destination email address (you may want to send this email to yourself to verify that the code actually works).

I used the code above to send myself an email and this is what arrived in my email inbox.

Python Sending Email Using Smtp

The smtplib python module defines an SMTP client object that can be used to send email to any machine running an SMTP server.

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In our case, the machine running the SMTP server is and we want the client application (running on our laptop) to be able to communicate with that server.

You can use smtplib.SMTP or smtplib.SMTP_SSL to create a client object. The difference is that smtplib.SMTP_SSL uses a secure encrypted SSL protocol to connect to the SMTP server, whereas smtplib.SMTP does not.

Gmail does not allow communication over a non-SSL or non-TLS channel, so we cannot use smtplib.SMTP to talk to gmail.

We will need some of these settings to configure our client to properly talk to the SMTP server in gmail.

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SMTP Server Address: This is the IP address or domain name of the machine where the SMTP server is running. For Gmail, this address is

SSL required: This indicates that the SMTP server requires communication over a secure encrypted SSL channel. This is a requirement for Gmail. This is why we use smtplib.SMTP_SSL instead of smtplib.SMTP.

As we all know of course gmail requires our usernames and passwords so in our case authentication is required.

Python Sending Email Using Smtp

SSL Port: This is the port the SMTP server is listening on. The port number (465) together with the SMTP server address ( uniquely identifies the full address of the SMTP server so that our client code can communicate with it.

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The difference between a server address and a port number is that a server address only points you to a machine running an SMTP server.

But this machine is running many applications but ONLY the SMTP server is listening on port 465.

If you want to constantly improve your understanding of networking concepts, I recommend this book by Ross and Kouros. The book is written in a very interesting manner and is very easy to understand.

I hope the code makes more sense to you now. The arguments to the SMTP_SSL() function are the address and port number of the SMTP server.

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This function attempts to connect to an SMTP server located at and listening on port 465 over a securely encrypted SSL channel. Returns the smtp object specified by the variable named server.

We know from previous discussion that gmail requires authentication. If you try to send an email without authentication first, the gmail server will return an authentication error.

Needless to say, you’ll need to replace the method arguments in the code above with your own credentials.

Python Sending Email Using Smtp

The smtp objects have another method called sendmail that requests the SMTP server to send email. To send, it requires a source email address, a destination email address, and the content of the email.

Solution: Python3 Sending Email Using Smtp

After using the code above to send an email, you will notice that the email subject is not in your Gmail inbox.

Check your email library. It will make your life easier when working with emails. You can still achieve your goals without any additional modules, but it will require you to delve into the SMTP protocol a bit more.

Karim holds a PhD in computer science from the University of California, Santa Barbara. He has more than three years of experience teaching CS to undergraduates, more than 5 years of research experience, and currently works for a Fortune 100 company. He is mainly interested in distributed systems, machine learning, fitness and football. In most applications, you need to communicate with your users using electronic methods. Email is used to reset passwords, confirm orders, and verify user accounts. Whatever the reason, whatever language you use, the email process is always the same.

Before diving into the code, you need to understand how email works. When you send email from a web-based application or native software running on your computer, your client software packages the message and sends it through an SMTP (Simple Mail Transfer Protocol) server.

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This server is required to send email from an email client such as Outlook or Thunderbird, or from a Python program. When you open a hosting account with a company, they provide you with SMTP credentials to send email through their servers.

There are many open, free SMTP servers, but they are often used by spammers and are blocked by most incoming mail servers. It is better to use a password-protected SMTP server so that your mail reaches the recipient instead of being filtered and thrown into the recipient’s spam folder.

The SMTP server is not always an external server on the host. In some cases, you’ll be sending email from the same machine running your Python code. Then you use “localhost” as your SMTP server. Consult your email provider’s documentation for the correct configurations for this Python email example. I will use Gmail for this example.

Python Sending Email Using Smtp

When you want to send an email to a recipient, you must first collect the email settings. This can be from user input or hardcoded into your code.

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Note about the sender address: You can use any email address, but some incoming servers (such as Gmail) may detect fake sender addresses for security purposes and throw your email into the spam folder.

So it’s better to use a “real” email address that actually exists. You can then set it as a “Do Not Reply” sender to prevent users from replying to the message instead of using a fake email address. In some cases, the SMTP server rejects the message and the recipient cannot receive the email at all.

Library. This library stores most of the code in its own methods and properties,

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