Ask HN: Email client web component/widget

Been looking for a email web client solution that I can embed in my customer's CRM solution with no luck. Does anyone have any idea if such component exists? It should have all the basic features such as Inbox syncing, compose/reply/forward emails.

Currently all I can think of is to use Java libraries like http://jodd.org/doc/email.html#receiving-emails and build it myself but I do not have a decent idea about the scale/scope of this undertaking.

Please suggest if there is any better way to handle this case.