I believe you're referring to this: https://wikileaks.org/podesta-emails/emailid/31077

Podesta is on record saying that "we need to clean this up" when this discrepancy surfaced.

No it didn't. Unless I'm the only person who doesn't check the domain of every email that arrives in his inbox.

Obama is not Sherlock Holmes, and he can be unaware of something, even if there is evidence he could possibly have seen. You need a little more evidence than that to call somebody a liar.