Can't delete certain emails from Galaxy Ace combined inbox

This morning, because my computer's Internet access was down, I temporarily added another Yahoo account to the native email app on my Samsung Galaxy Ace, and several messages were downloaded. I later deleted the account, which I don't normally want on the telephone, but three messages to it remained in the combined inbox, and I'm unable to delete them by using any of the alternative means of deletion. It always says "This item will be deleted", but it doesn't get deleted.

I tried deleting all but one account to get rid of the combined inbox, but as soon as I restored my other accounts (either with or without the Yahoo one to which the messages had been sent) the three undeletable messages reappeared in the combined inbox and were still undeletable. BTW, when I open the messages in question they appear totally blank (although the title and sender are visible in the list of messages), but the minute I start to forward one all the message content becomes visible.

I very much want these messages deleted from my telephone. Can anybody please help??

 

Can anybody tell me what would happen if I went into "Manage applications --> Email" and clicked on "Clear data"? If that would get rid of the undeletable messages in the combined inbox without doing other irreparable damage, I'd be willing to reinstall my four email accounts. There are no old messages on the phone that I want to keep, so could this be the answer?

 

Yes, it worked. Thanks. I had to reinstall my four email accounts, but that took me just a few minutes and was well worth it to get rid of those messages that wouldn't delete. I guess the moral of the story is to be sure to delete all messages from an email account before deleting the account from the phone's native email app...