sending.ac

sending.ac is pure infrastructure — it handles the mailbox provisioning and DNS authentication layer that agencies, RevOps teams, and high-volume SDR orgs typically spend hours configuring manually. On the agentic readiness front, there's no API and no MCP server; this is UI-only, which means you can't drive it programmatically from an agent or orchestration layer without scraping — a real ceiling if you're building automated outbound workflows. At $0.44 per mailbox it's near-free to test relative to what broken deliverability costs, but the 450-mailbox minimum (~$198 entry) means it's sized for teams already running at volume, not someone spinning up their first sequence. The honest gap is integrations: none are listed, so you're managing this as a standalone infrastructure layer and stitching it to your sequencer yourself.