Smartlead connects an unlimited number of sending mailboxes and rotates campaigns across them to protect deliverability, backed by a warm-up network of participating inboxes. Sequences can branch across email, LinkedIn steps and calls, replies land in a unified master inbox, and agency accounts get client sub-workspaces with white-label reporting. It integrates with the usual CRMs and exposes an API and webhooks. Its pricing page also lists inbox-provisioning partners (AeroSend, InfraInbox, Zapmail, Mailreef) with their own per-mailbox prices, which are separate products and easy to mistake for Smartlead plans.
See related.