Kelvin,
I'm not sure you would want to disable these warning, but you can find the corrupt email by following the warning message.
Example... WARNING: "\\XSERVER\Microsoft Exchange Mailboxes\UserName Top of Information StoreSent Items
Go to the mailbox that is in the warning message and then the correct Item bin, above would be the Sent Item bin.
Keep reading the Warning message and if the email has a subject you should be able to see it, do a search for it and delete. If it just says RE: then some searching will have to take place. You could do a Find for subject RE and that should help.
Adam