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Sending Emails with Attachments Using SendGrid in Python

Arjun JS

A step-by-step implementation of sending an email with attachments using SendGrid in Python.

Step 1: Import the necessary modules
We begin by importing the required modules for our implementation:

import os
from sendgrid import SendGridAPIClient
from sendgrid.helpers.classes import Mail
from sendgrid.helpers.mail import Attachment, FileContent, FileName, FileType, Disposition

Step 2: Define the send_email function
Next, we define the send_email function, which takes parameters for the sender’s email, recipient’s email, subject, plain text content, HTML content, and attachments (optional):

def send_email(sender_email, recipient_email, subject, plain_content, html_content, attachments=None):
    message = Mail(
        from_email=sender_email,
        to_emails=recipient_email,
        subject=subject,
        plain_text_content=plain_content,
        html_content=html_content)

Step 3: Handle attachments (if provided)
If attachments are provided, we iterate over each attachment file and create a SendGrid Attachment object for it. We read the file contents, set the file name, type, and disposition as necessary:

    if attachments:
        for attachment in attachments:
            with open(attachment, 'rb') as file:
                attachment_data = file.read()
            attachment_file = Attachment(
                FileContent(attachment_data),
                FileName(os.path.basename(attachment)),
                FileType('application/octet-stream'),
                Disposition('attachment')
            )
            message.attachment = attachment_file

Step 4: Send the email
We proceed to send the email using the SendGrid API. We instantiate the SendGridAPIClient with the API key, then send the message:

    try:
        sg = SendGridAPIClient(api_key=os.environ.get('SENDGRID_API_KEY'))
        response = sg.send(message)
        print("Email sent successfully.")
        return True
    except Exception as e:
        print("Error sending email:", str(e))
        return False

Full Implementation below

import os
from sendgrid import SendGridAPIClient
from sendgrid.helpers.classes import Mail
from sendgrid.helpers.mail import Attachment, FileContent, FileName, FileType, Disposition

def send_email(sender_email, recipient_email, subject, plain_content, html_content, attachment_paths=None):
    # Create a Mail object
    message = Mail(
        from_email=sender_email,
        to_emails=recipient_email,
        subject=subject,
        plain_text_content=plain_content,
        html_content=html_content)

    if attachment_paths:
        # Iterate over attachment paths and add attachments to the email
        for attachment_path in attachment_paths:
            with open(attachment_path, 'rb') as file:
                attachment_data = file.read()
            attachment_file = Attachment(
                FileContent(attachment_data),
                FileName(os.path.basename(attachment_path)),
                FileType('application/octet-stream'),
                Disposition('attachment')
            )
            message.attachment = attachment_file

    try:
        # Send the email using the SendGrid API
        sg = SendGridAPIClient(api_key=os.environ.get('SENDGRID_API_KEY'))
        response = sg.send(message)
        print("Email sent successfully.")
        return True
    except Exception as e:
        print("Error sending email:", str(e))
        return False

Step 5: Call the function with desired parameters
Finally, we call the send_email function, passing the appropriate values for the sender’s email, recipient’s email, subject, plain content, HTML content, and attachments (if any):

plain_text = "This is the plain text content of the email."
html_content = "<h1>This is the HTML content of the email.</h1><p>It can include <strong>formatted text</strong> and other HTML elements.</p>"
attachments = ['path/to/file1.pdf', 'path/to/file2.jpg']
send_email("sender@example.com", "recipient@example.com", "Hello", plain_text, html_content, attachments)

That’s it! With these steps, you can send an email with attachments using SendGrid in Python. Feel free to customize the function and parameters according to your specific requirements.

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