One observation I wanted to share is which I did not took notice earlier is that eM client does not accept cut and pasted password while setting up an account. In the days when you need to refresh or have at least a 16 alphanumeric long password to avoid hacks, it would be easier if the software could find a way to accept this. Instead, once I use keystrokes to type in the password, it was no problem to get access to the account.
The ticket is solved in itself, but if some have some theoretical arguments around why this is the way it is, it would be an interesting read. Or if it helps somebody else, that all passwords need to be typed in to eMclient. It does not work with cut and paste.