[New-bugs-announce] [issue44742] smtplib: less confusing behaviour when giving incorrect multiple recipients list

[Célestin Matte]

New submission from Célestin Matte <python at cmatte.me>:

When giving recipients in a string format ("email1, email2") to sendmail(), an email is sent to the first email in the list only.
This is not a bug since the documentation indicates that sendmail() takes either a list of addresses, or a single address in a string. However, this error is easy to make since the "To:" field expects a comma-separated series of email addresses in a string format.

I suggest either that:
- sendmail() accepts a series of emails in a string format: "email1, email2" for the recipient lists
- sendmail() raises an exception if a series of email in a string format is detected

Attached is an example script to test confusing behaviour (email is sent to email1 at mydomain.com only):

----------
files: test_sendmail.py
messages: 398228
nosy: cmatte
priority: normal
severity: normal
status: open
title: smtplib: less confusing behaviour when giving incorrect multiple recipients list
type: enhancement
Added file: https://bugs.python.org/file50182/test_sendmail.py

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<https://bugs.python.org/issue44742>
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