@K9 posted:A helpful tip I learned on this site- if the email does not have the standard "Unsubscribe" link at the bottom it is much less likely to be part of an automated campaign.
I think that's true, but I also think that many coaches use the same platform that is used for bulk mails to send out more targeted emails, particularly in D3. Another tip I learned here is that inclusion of the coach's cell phone number is a good sign.