specific smarthost based on email header data

Hi All

We plan on upgradeing to Exchange 2010 and then 2013. Our requirement is that we have a service provider who handles our bulk email and one that handles our non-bulk email

My Question is - in 2010 or 2013 Can Exchange be configured to inspect the email and based on a custom string in the header of the email (eg. X-Header BULKMAIL)  use a specific Send Connector who should use a specific smarthost

Thanks in advance