EmailMessage doesn't strip empty addresses from recipients in message headers

[Konstantin Alekseev]

Example

        email = EmailMessage(
            'Subject', 'Content', 'from@example.com', ['to@example.com', ''],
            cc=['cc@example.com', ''],
            bcc=['', 'bcc@example.com'],
            reply_to=['', None],
        )

        msg = email.message()
        msg['To'] == 'to@example.com, '
        msg['Cc'] == ', cc@example.com'
        msg['Reply-To'] == ', None'

Fix ​https://github.com/django/django/pull/12164

[Mariusz Felisiak]

EmailMessage it's not responsible for sanitizing an input and should not strip any email addresses. You should validate them before passing to the EmailMessage.

[Konstantin Alekseev]

EmailMessage it's not responsible for sanitizing an input and should not strip any email addresses

EmailAddress.recipients inconsistent with that statement, it strips empty emails as a result actual email headers are not equal its result.