How delete all entries in IMAP Inbox only on device

[pavarang]

Hello,
i'm working with 3rd Ed MR.
Using InternetEmail example from Nokia and Imap4Example from Symbian i was able to create an IMAP email account, retrieve headers from server and populate.
Now i'd like to implement a delete of all messages in Inbox, but only locally on the phone.

I've written some code,but it's not working :-/

void CCleanupMailManager::DeleteAllMailsL(void)
{
	
// find mailbox id (iId)
iId = FindServiceL();
	
if(iId == KMsvRootIndexEntryId) {
	// mailbox not found!
    	User::Leave(KErrNotFound);
}
	
iEntry = iMsvSession->GetEntryL(iId);
const TMsvEntry& child = (*iEntry)[0];
iInboxId = child.Id(); // this is the Inbox Id
    	
iMsvOp = iEntry->DeleteL(iInboxId,iStatus);
    
SetActive();
	
}

DeleteL returns in RunL() with iStatus==KErrNone, so everything seems ok, but if i open my mailbox via native Messaging app, all messages are still there.
What i am doing wrong and how can i delete messages only locally on the device and not on the server? i couldn't figure out.

thank you in advance
pg