When i delete an email, many times it will delete the “next email” also. Sometimes two “next” emails to read. I have my mouse set on one click. I only have this problem eM.
I remember seeing this same question in the past.
What version of eM Client are you using Patrick?
If it is not the latest, is the behavior the same if you download and install the most recent from the Release History?
Are the messages related in any way, like part of the same conversation?