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  1. Code
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Code

Sending Emails in Python With SMTP

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Difficulty:IntermediateLength:MediumLanguages:

This tutorial will give an introduction to SMTP, a Python module used for sending mail. It will also demonstrate how to send different email types like simple text emails, emails with attachments, and emails with HTML content.

Introduction to SMTP

The Simple Mail Transfer Protocol (SMTP) handles sending and routing email between mail servers.

In Python, the smtplib module defines an SMTP client session object that can be used to send mail to any Internet machine with an SMTP or ESMTP listener daemon.

Here is how to create an SMTP object.

Create and Send a Simple Email

The following script will allow you to send an email via the Gmail SMTP server. However, Google will not allow logging in via smtplib because it has flagged this type of login as "less secure". To solve this, go to https://www.google.com/settings/security/lesssecureapps while you're logged in to your Google account, and "Allow less secure apps". See screenshot below.

Create and Send a Simple Email

We will follow the following steps to accomplish this process:

  • Create an SMTP object for connection to the server.
  • Log in to your account.
  • Define your message headers and login credentials.
  • Create a MIMEMultipart message object and attach the relevant headers to it, i.e. From, To, and Subject.
  • Attach the message to the message MIMEMultipart object.
  • Finally, send the message.

This process is as simple as shown below.

Note that the ‘To' and ‘From’ addresses must be included in the message headers explicitly.

Create and Send an Email With an Attachment

In this example, we are going to send an email with an image attachment. The process is similar to sending a plain text email.

  • Create an SMTP object for connection to the server.
  • Log in to your account.
  • Define your message headers and login credentials.
  • Create a MIMEMultipart message object and attach the relevant headers to it, i.e. From, To, and Subject.
  • Read and attach the image to the message MIMEMultipart object.
  • Finally, send the message.

The MIMEImage class is a subclass of MIMENonMultipart which is used to create MIME message objects of image types. Other available classes include
MIMEMessage and MIMEAudio.

Create and Send HTML Emails

The first thing we are going to do is create an HTML email template.

Create an HTML Template

Here is the HTML code for the template, and it contains two table columns each with an image and preview content. If you prefer a ready-made, professional solution, grab our best email templates. We have a number of responsive options with easy-to-customize features to get started with.

The template will finally look like this when complete:

The HTML Template

Below is the script for sending an email with HTML content. The content of the template will be our email message.

Execute your code, and if no error occurs, then the email was successful. Now go to your inbox and you should see your email as HTML content nicely formatted.

Formatted HTML email

Conclusion

This tutorial has covered most of what is needed to send emails for your application. There are several APIs available for sending emails, so you don't have to start from scratch, e.g. SendGrid, but it's also important to understand the basics. For more information, visit the Python docs.

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