How can I send attachments in an email reply?

Question

I'm using the exchangelib package to connect to Exchange. I need to send attachments in a reply. When I send a normal message I add the attachment to the Message object like this:

message = Message()
message.account = account
message.subject = 'subject'
message.body = 'text'
message.to_recipients = [Mailbox(email_address='[e-mail]')]
message.cc_recipients = ['[e-mail]']

for attachment in attachments or []:
    with open(attachment['path'], 'rb') as f:
        file = FileAttachment(name=attachment['file_name'], content=f.read())
        message.attach(file)

and to send a reply:

reply = message.reply(
    subject='Re: subject',
    body='texto',
    to_recipients=['[e-mail]']
)

This works, but I don't now how to add attachments to the reply. I tried to set the attributes "attachments" and "attach" but the object doesn't have them.

Answer 1

The Message.reply() method creates and sends a ReplyToItem item which doesn't support attachments. See https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/replytoitem

So if you want to send a reply that has attachments, just create a normal Message item that has a 'Re: some subject' title, contains the attachment, and quotes the original message, if that's needed.