Nokia 6233; how to remove defunct email accounts and inboxes?

When I go to email-->Inboxes, I see multiple inboxes that are leftovers
from past attempts at setting up email on my phone. Only one Inbox is
functional, but how do I remove the others? When I select a defunct
inbox and go options-->delete, it only deletes the mail inside the
inbox, not the inbox itself.

Secondly, when I go email-->check new mail, I am presented with two
email accounts; again i would like to lose one of these. Any ideas how?

Many thanks!