Alright maybe this title is a bit strong but that's just how I feel about default KDE email client. It took me forever to set it up properly with Runbox account but that's okay, I am not gonna blame linux software for being user unfriendly. My grudge with Kmail is that it would have been a perfectly good email client if it wasn't for the annoying Outlook 2013 wanna be default mail view divided into Yesterday , Two Days Ago, Sunday, etc... Why is everybody trying to imitate microsoft? Their Ribbon UI and widescreen laptops is just not compatible. Thank God libre office developers had some kind of brain and they did not push for it. But Kmail would have been a good email client, well integrated with openSUSE if it wasn't for their email default UI which makes reading and sorting emails 3x times harder. Another problem with KMail is the damn KDE wallet. Why do I have to type in my password every time? Anyways, I think Kmail is a huge mess. I have installed Evolution, i think it's Gnome based and it's working fine with traditional office 2003 theme and it remembers my password too.