Great service. Free, private and secure. Really no issues at all except they had a search feature before and got rid of it for their latest version of the app but if they put it back in for next upgrade then I'm totally happy.
You can keep your emails private, retract messages sent by mistake, delay when to send message, view status on when recipient has read your message, plus they have a lot of storage space and you can make online ebiz cards.
Pros: No ads, No spam, pre-inbox filter, SSL secured, privacy
Cons: need feature to search through email, need for outlook
more