When I move or copy a message to a different folder claws highlights the first folder in the list. This is usually the wrong account for me because of bug 2487 and I keep forgetting to correct it because my two accounts have similar folders. Rather than rely on fixing 2487 to solve this I think a better solution would be to preselect the account that the message is being copied/moved from.
accounts are not necessarily linked with mailboxes, e.g. several pop accounts can share a single MH mailbox