Google Contacts, the address book built into Gmail, lets you keep track of all your contacts, see when you last interacted with them, and more.
Send approved attendee messages and report send failures.
Your group mailing goes out from the team mailbox, with duplicate addresses skipped and a reply showing sends and exceptions.
Send personalized event updates to eligible contact groups.
Your mail merge uses a saved contact group, sends personalized emails from your mailbox, and reports every send, skip, or failure.