Emailing buyers list prior to actually having property under cont

[Brice Burns]

My partner and I are close to grabbing a wholesale deal, which consists of two sets of two duplexes (two on one side of town, the other two are on the opposite side of town). We've got a meeting with the seller to sign the contract for 30 days, tomorrow afternoon. We're getting these duplexes for a steal and know we'll have no problem with selling them quickly. 

Our question is, would it be wise to email our buyers-list prior to having the contract signed? If so how would you word this to buyers?

Or, should we just wait until we have the contract signed tomorrow before we begin emailing our buyers?

Thanks!