Sending Emails With Python (Overview)

Christopher Trudeau
Sending Emails Using Python Christopher Trudeau 01:48
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You probably found this video course because you want to send emails with Python to automate confirmation messages, password resets, or scheduled notifications. Python’s standard library covers the whole pipeline, from making a server connection to building the message and sending it to one or many recipients. This video course walks through every step in working code.

By the end of this video course, you’ll understand that:

  • A safe testing setup uses a throwaway Gmail account with an app password, a local aiosmtpd debug server, or a privacy-focused provider like Posteo or Proton Mail.
  • A secure SMTP session uses .SMTP_SSL() with ssl.create_default_context(), which validates the server certificate and encrypts your credentials and message content.
  • The EmailMessage class from the email package assembles plain text, HTML alternatives, file attachments, and personalized fields through .set_content(), .add_alternative(), and .add_attachment().
  • Setting msg["reply-to"] or any other RFC 5322 header on an EmailMessage routes replies to a different mailbox than the sender address.
  • For high-volume sending, transactional email services like SendGrid, Mailgun, and Brevo provide deliverability, statistics, and API libraries that go beyond what smtplib alone offers.

Before you jump into the code, you’ll set up a throwaway email account or a local debug server so you can experiment freely without spamming real inboxes.

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Sample Code (.zip)

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00:00 Welcome to Sending Emails Using Python. My name is Christopher, and I will be your guide. The title says it all, folks. This course is about sending email from a Python program.

00:11 In it, you’ll learn about SMTP, which is how you talk to a mail server. That is, send an email, of course, adding HTML content to your email, along with attachments, and finally, how to connect to real-world servers that require you to log in before sending something.

00:30 The code in this course was tested with Python 3.14.2. To demonstrate how email sending works, I’m also using a development mail server. It’s in a third-party package called aiosmtpd.

00:43 The latest version of that, when I tested, was 1.4.6. If you have a mail server of your own, you don’t have to use this package, but it’s there for you to better understand how all this stuff works.

00:55 When you send an email, your email client is using a protocol known as SMTP. Python has a couple of modules that can help you send email, the first of which is smtplib, which is what actually sends the mail.

01:09 And the other is the email module, which simplifies the construction of the data structure you need to compose a message. Using these modules, you can send text-only email, add HTML content to your email, attach files, and even specify multiple recipients, including using the CC and BCC fields.

01:31 To send an email, you need to connect to a server. In this course, I’ll start out with a local development one, then proceed from there to show you how to connect to a real-world server that requires authentication. Next up, I’ll get started by demonstrating SMTP.

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