How Can I Efficiently Send Emails to Multiple Recipients Using Python\'s smtplib?

Efficient Email Delivery to Multiple Recipients with Python's smtplib

Many developers have faced challenges in sending emails to multiple recipients using Python's smtplib library. The traditional approach of using smtplib's sendmail(to_addrs, msg) with a list of email addresses as the to_addrs parameter has not yielded desired results. Instead, only the first recipient would receive the email.

The crux of the problem lies in the difference between the expected input formats for smtplib and the email.Message module. To ensure successful delivery to multiple recipients, the "To", "Cc", and "Bcc" headers in the email message (msg) should be specified as strings with comma-delimited email addresses, such as:

<code class="python">msg = MIMEMultipart()
msg["To"] = "[email&#160;protected],[email&#160;protected],[email&#160;protected]"
msg["Cc"] = "[email&#160;protected],[email&#160;protected]"</code>

However, the to_addrs parameter of sendmail() expects a list of email addresses. To accommodate this requirement, split the comma-delimited strings into lists, as demonstrated in the following code:

<code class="python">smtp.sendmail(msg["From"], msg["To"].split(",") + msg["Cc"].split(","), msg.as_string())</code>

By adhering to these guidelines, developers can leverage the power of smtplib to effectively send emails to multiple recipients, ensuring that all intended parties receive the intended messages.

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