The concept and the fact that recipient can see right away that this is a registered email and, presumably, it could be legally binding. Review collected by and hosted on G2.com.
I've been using RMail for the past three months now, and while the ideas behind this product are very good, the implementation leaves a lot to be desired. The biggest problem is the lack of reliability with delivery of the "Opened" receipt by RMail. You get an Ack and a receipt of delivery to a mail server receipt right away, but you only get a followup "Delivered and Opened" receipt in only 50% of cases. In many situations, I would receive a response to my email, but no receipt from RMail that the original email was opened. It defeats the whole purpose of RMail, any email client today provides you with the delivery receipt, but it's the "opened" receipt that matters. There are many other minor issues with the implementation of RMail, but this one is the biggest problem. Review collected by and hosted on G2.com.
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Organic review. This review was written entirely without invitation or incentive from G2, a seller, or an affiliate.