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Winmail.dat on Office 365 AWS EB
When using Flask-Mail on AWS to send emails via GoDaddy/Office 365 (Exchange), the emails arrive at destination packaged as a winmail.dat attachment. Despite extensive messing with Exchange settings this was unresolved.
Upon switching to a different email plugin all works smoothly, so I believe this is an issue with Flask-Mail.
Wierdly, and very annoying for debugging, when testing on my local windows dev server, emails are sent fine without any winmail issues.