No, I just find a solution. It was not a old list copied from my computer but a setting on my phone. Contact-names of opened incomming emails showed automaticly also in the list that opens when creating a new e-mail. That's what I did't want to happen
So far I could not find anything about this subject in the manual, not the Dutch one, neither the
English one.
To keep trying, I took a better look at the menu on the phone and found my solution;
In my ( Dutch ) version of the phone, but not in the manuals, I found following setting;
open home-screen
click message button to open
press menu
click options
click general
change the field " show recent contacts when composing e-mail "into NO
press menu
click save
Now contacts of opened incoming e-mails don't show up anymore when by composing a new
e-mail clicking the "To" field and also the question of how to delete contacts in this openings-list is answered
There is also no need anymore too, deleting anything
So for me no problem anymore
and thanks Neolantis