I just want to send and receive email, store it on my computer. I don't want to integrate with calendar or anything. Just that. I don't use any other device than my desktop. And ease of use, where I don't need to learn commands that I will forget immediately. And the ability to search. The technician at my email provider said it has to do with the local settings of my email client, that makes the receivers interpret it as spam. Or if you can suggest another email client. In my repository there seems to be Enigmail, Claws-mail, Evolution, Sylphead.