How to Send Email Attachments Using Python's smtplib?

Sending Attachments with Python's smtplib

Sending emails with Python's smtplib is a breeze, but including attachments can seem a bit cryptic for beginners. Here's a straightforward explanation to help you master this task.

Code Snippet:

Let's start with a simple code snippet:

import smtplib
from os.path import basename
from email.mime.application import MIMEApplication
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.utils import COMMASPACE, formatdate

def send_mail(send_from, send_to, subject, text, files=None,
              server="127.0.0.1"):
    assert isinstance(send_to, list)

    msg = MIMEMultipart()
    msg['From'] = send_from
    msg['To'] = COMMASPACE.join(send_to)
    msg['Date'] = formatdate(localtime=True)
    msg['Subject'] = subject

    msg.attach(MIMEText(text))

    for f in files or []:
        with open(f, "rb") as fil:
            part = MIMEApplication(
                fil.read(),
                Name=basename(f)
            )
        # After the file is closed
        part['Content-Disposition'] = 'attachment; filename="%s"' % basename(f)
        msg.attach(part)


    smtp = smtplib.SMTP(server)
    smtp.sendmail(send_from, send_to, msg.as_string())
    smtp.close()

Explanation:

1. MIMEMultipart: MIME messages support multiple MIME parts and form the outermost layer.
2. MIMEText: The email's body is created as MIMEText containing the text.
3. MIMEApplication: The file to be attached is treated as MIMEApplication and its name is extracted using basename(f).
4. Content-Disposition: This field configures the attachment's handling by email clients, specifying it as an attachment with its name.
5. SMTP: An SMTP object is set up to connect to a mail server ("127.0.0.1" by default).
6. sendmail: The email is sent using the sendmail method with the sender, recipients, and message.

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