Really messed up need your help

I SENT A THANK YOU EMAIL AND HAVE A SMALL TYPO I JUST RELAIZED !!! Can I undo it? Do I resend the same thing with it fixed? Do I make a joke bout it? LEAVE IT ALONE? I'm freaking out!!!!!!!!!!! I did so good on interview and don't want to ruin it with this DUMB mistake!!!
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums