@mjopson - One tool to track whether or not they opened it:
http://www.yesware.com/product-tour/email-tracking/Another service:
http://lifehacker.com/5981928/bananatag ... ere-openedUsing google analytics to track email opens:
http://www.labnol.org/internet/email/tr ... tics/8082/If people ARE opening your email and not replying, you may try following up with a different pitch after interacting with them on social media, sending them a note about an article they've written to start a dialogue, or updating them when you reach a milestone
You could also plug their name into your LinkedIn, see if you have any 2nd degree connections, and ask for an introduction if you do.