When typing in the recipients input field, a useful suggestion list is shown. However, for a specific search term, the list is ordered arbitrarily (may be alphabetical order). So for example, when a recipient has multiple mail addresses, the user must always scroll down in the list to select the desired address, if the first one shown is not the desired address.
Therefore it would be helpful, if the suggestion list would be sorted in the order of usage, by which I mean a) the number of times a specific entry was selected or b) the number of times an email has been sent to this specific address.