Since the latest update (I think), eM Client has been occasionally trimming all empty lines upon sending the email, resulting in very ugly emails which are a bit embarrassing, So for example sending this:
Hi Ms. Doe,
I would like to thank you for your email.
Becomes :
Hi Ms. Doe,
I would like to thank you for your email.
I haven’t found a consistent way to reproduce this, but maybe the developers would know where to look at?
I tried to reproduce it, but was not successful. Not once.
If you think this is because of the recent update, then you can uninstall eM Client and download the previous version from the Release History. When uninstalling eM Client, you will be asked if you want to delete the database directory. If you choose not to delete the database, all your data and settings will be there once you have downgraded.
I tried the exact same thing yesterday, but did not paste as text. Even if you paste normally, then change the format to plain text, it does not seem to happen.
Best is if you have a Pro License, open a support ticket so that the developers can fix it.