Check for file existence in ssis and if not send an email ending the package successfully

Hello,

I have to do a SSIS package wherein I need to check if a .XLSX file exists or not in a SCRIPT TASK and if exists it should continue the next dataflow task ,if the files does not exists then I have to send an email saying that the file doesn't exists and end the package successfully. Can anyone please help me out in this regards?? I have to delive this by the EOD. Any help is really appreciated.

Thanks,

NavMac