colonels, if they have previously given you a backup message, when they drop you will get an email. They do start at 11 am eastern on 2nd day. I just had 4 drop. Here is a sample of the emails I got:
"I'm looking to be a big fish in a small pond so to speak and those other schools don't give me that. Call me if you want me at Montana St., Billings next season."
"After talking it over with my parents, Montana St., Billings seems like it may make sense for me after all. Call me."
Those came from the recruit himself obviously, and for another kid there was this from my AD:
"Remember xxxxxxxx? Doesn't look like he's signed anywhere yet - I think we have a shot at him. " (name redacted to protect my recruiting chances...lol)