Mutation - reassignCampaignEmailSender

Moves drafted Campaign emails to another sender, who reviews and sends them from their own mailbox. Each draft is signed again for the new sender, and the new sender is notified. Nothing is sent. Access: Campaign owner or workspace admin. Errors: a launched, sent or still drafting email, an email offering a meeting time from its current sender's calendar, or a sender who is not a workspace member with CRM access.