Improve Resend documentation and checks

[pfouque]

After 2 issues related to the usage of the reply() function, it wasn't clear what is the type of message variable.

• Improve documentation, with an example
• Add check and raise ValueError('Message must be an instance of django.core.mail.EmailMessage')
• BONUS: Fix doc format for "Supported Mailbox Types"

[enaut]

I had to also add the to field so that the email was actually sent.

from django.core import mail

def reply_to_message(message, subject, messagebody):
    rpl = mail.EmailMessage(
        subject=subject,
        body=messagebody,
        to=[message.from_header],
    )
    message.reply(rpl)

[enaut]

Though it might be worth adding that to the reply method?

if not to:
  add to from reply_to or from_header

[pfouque]

Interesting!
Is it something to document or should we expect the "reply" function to set it automatically...
WDYT @Pietro395 ?

[Pietro395]

Interesting! Is it something to document or should we expect the "reply" function to set it automatically... WDYT @Pietro395 ?

Interesting observation @enaut
In my opinion since you are using the reply function I would expect the “to” to be set automatically if not specified.

I think that's what a user would expect