Messaging Applet for KDE?

I've been using Mint/Cinnamon for several years for one reason: the messaging applet. It's the one piece of software that I use frequently,
and every day. Logging into my particular email provider on imap (Cincinnati - fuse.net) requires multiple clicks and pages for I guess security
reasons, and that app gets around all of that. But I'm having trouble with Mint 17 and graphics on my desktop machine. Gnome 3 has a
similar application in some versions, but every Gnome update kills all the extensions.

What it does is to open a sendmail window when I click on an icon. I fill in the address (it reads my Thunderbird data base and autocompletes)
and text and if appropriate, a link of interest or attachment, and then lets me send it with one more click and closes when done. No muss, no fuss.
I specifically want to avoid the much more extensive process of keeping an email client open and downloading endless emails, having lost some
3000 emails that way during an upgrade once. I have searched extensively for similar functionality in KDE, to no avail. Does anyone have a
suggestion?

Thanks in advance.