Ballast – cold email infrastructure with AI and MCP

Ballast is a cold email platform that charges per email sent rather than per mailbox or seat, with unlimited mailboxes, seats, warmup outside the quota, a Unibox, and API/webhooks/MCP access included on all five plans starting at $19/month for 20,000 emails. It paces sending per mailbox with random 4–10 minute gaps, routes SMTP mailboxes over static mail-only IPs, runs nightly SPF/DKIM/DMARC checks, and pauses mailboxes, campaigns or workspaces when bounces exceed a threshold. Every app action is also an MCP tool for Claude, ChatGPT and Cursor, with confirming calls required before anything sends, imports or deletes.