So this came about in 1982:
http://tools.ietf.org/html/rfc821
And we had some form of email since then.
Now, we put it in a browser, and... Well I just can't describe the fun as well as the masters of screwing up standard protocols can:
Microsoft is continuing to investigate an issue where messages may intermittently get stuck in the Outlook outbox or OWA (Outlook Web App) drafts folder before sending. This incident is occurring for some customers served from the Americas. Exchange online engineers have identified the root cause and are actively working on a solution to mitigate end-user impact. The next update will be provided by September 20, 2013 at 7:00 PM UTC, or upon service restoration.
Can't say more than that.