Trimming not always work

In conversation mode, trimming of content not always works and I can see all old messages from this conversation in every single message…

In my experience it works quite well, but I think it depends on how the quoted text is formatted by the sender’s email client. If the quote is indented or prefixed with >, then it seems to work quite well.

Is this happening with all messages, or just from certain senders?

Also, if you are not using the latest version of eM Client, you might want to download it from