The marketplace sales stack (Apollo.io, Clay, Gong, HubSpot, Salesforce, ZoomInfo) covers finding, enriching, scoring and logging but includes no plugin that connects a mailbox, warms it, verifies an address in real time or paces sends within safe limits.

NotesMarketing content for a sending product, so the framing is self-serving, but the underlying observation matches the marketplace category list. Gmail and Outlook plugins can send; what is missing is deliverability tooling.

Not one of them connects a mailbox, warms it, verifies an address in real time, or paces sends inside safe limits.