Microsoft Outlook is a web-based suite of webmail, contacts, tasks, and calendaring services.
Email released packets to named recipients and return a delivery ledger.
Your finished packet goes to the people you name, with a delivery ledger showing failed addresses and messages still pending.
Send each new client their kickoff details and preparation.
Your new clients get an automated welcome email with kickoff details and next steps. You hear when it arrives or what needs fixing.