Teams needs inline email expansion
When email is used to send a message to Teams, users need to download the associated .eml to read the complete message. Being able to expand and read the message inline would be much more fluid.
Charles Charlton commented
I'd like to elaborate on this further. Incoming e-mail should be parsed and re-formatted when certain formatting standards are met. As originally stated, take the body and post it as a conversation message not an abbreviated EML. Also, any @mentions should be parsed and re-tag channel members if the email exists in the team.