Send Bulk Emails with Attachments Using Python SMTP

In scenarios such as continuous integration alerts and operations monitoring, sending emails is often required. Python scripts provide a quick way to implement bulk, HTML, and attachment email sending using SMTP.

Preparation

Enable all SMTP‑related services in the mailbox settings.

Record the mail server address, connection method, and port.

Create an authorized password and keep it safe.

Connect to Mail Server and Login

Import smtplib. Depending on the requirement, create either a plain connection (port 25) or an SSL connection (port 465) using the server host smtp.exmail.qq.com. Log in with the mailbox account and the authorized password; successful login confirms the connection.

Send Plain Text Email

Verify the login status, then build a MIMEText object containing sender, recipient list, subject, and plain‑text content (content_type plain). Use the sendmail method to dispatch the message.

Send HTML Email

To send HTML content, change the content_type to html and optionally use an external template. The rest of the workflow remains the same.

Send Attachments

Import MIMEMultipart from the email module to create a multipart message. Build the text or HTML part as before, then iterate over a list of file paths, create a MIME part for each attachment, set its filename, and attach it to the multipart message.

Summary

After the functional code is ready, use getopt to parse external command‑line arguments, making the script easy to invoke with different parameters.

Execute Script

Run the script and verify that the bulk email with attachments is received.

Received bulk email with attachment: