Comlink: Emails With Attachments Fail

[jsayles]

Emails to staff@ or team@ that have a word doc attachment fail to send with the following error. It is not clear if this is all attachment types or just word documents.

Exception:
'utf-8' codec can't decode byte 0x85 in position 16: invalid start byte

The problem stems from the Python3 conversion and is specifically at line 100 in mailgun.mailgun_send where the attachment files are added to the requests.post.

The files are retrieved using open(path) in comlink.signals line 29. This returns a TextIOWrapper in UTF-8 encoding. When that wrapper is accessed, the exception is thrown.

[jsayles]

I added a mode='rb' in the open command to pull the attachment data in as binary.