Thank you for providing a free version of this great software!
I have a suggested tweak: it would be great if eM Client auto-expanded nicknames into email addresses (without the need to select a name from the pop-up list).
I use the nickname field extensively. But at the moment, when I type a nickname, I have to pause for the auto-complete options to show up, and then I have to select one of the options. If what one types is an exact match for an existing nickname, one shouldn’t need to pause and select: the address should be auto-expanded automatically as soon as one presses “tab”.