Exchange & Outlook display blank emails

For whatever reason, it looks like Exchange Webmail and Outlook don't like plain-text emails with \r\n newlines- they will display them as 'blank' messages.

I don't really expect you to merge this- it subverts 90% of the function- but I'd like you to be aware of the issue, and make it easy for other people to find the problem.

I don't really know if there's a good solution without pulling SMTP functionality inside of alot, unfortunately.