Setup is yours. The rest runs.
Mainspring works in three stages. You wind it, agents run the loop, and the escapement keeps the loop inside its limits. Here's what happens at each stage.
What you decide once.
These decisions take a few working sessions. Everything the agents do afterwards follows from them, so it's worth getting them right.
- 01Ideal customer profileFit criteria, disqualifiers and the trigger events worth acting on, built from your won and lost deals.
- 02Buyer personasWho you write to at each account, and the one problem each of them owns.
- 03OfferWhat you're asking prospects to say yes to: a call, an assessment, a pilot.
- 04Claims libraryThe facts, proof points and phrasing the writer may use. Anything not in it doesn't go out.
- 05LimitsDaily volume, bounce and complaint thresholds, regions, exclusions and do-not-contact lists.
- 06ConnectionsYour CRM and calendar, plus the sending domains Mainspring sets up and warms.
Six agents, each turning the next.
The agents run continuously. New signals bring new accounts in, replies move people out, and what gets answered shapes the next round of writing.
Research
Builds and refreshes the account list from your fit criteria and live trigger signals: funding, hiring, leadership changes, migrations.
Contacts
Finds the buying committee at each account, verifies every address before it's used, and records why each person is worth writing to.
Writer
Drafts short, specific messages tied to one problem each recipient owns, using only claims from your approved library.
Sender
Runs separate sending domains and mailboxes, warms them, paces volume and watches bounce and complaint rates.
Replies
Reads every reply, stops the sequence, answers routine questions and objections, and hands real interest to booking.
Booking & report
Books qualified meetings onto your calendar with a brief, logs everything to your CRM, and reports on meetings and pipeline.
Controls that keep the loop in bounds.
An escapement lets a spring's energy out one tick at a time. These controls do the same for Mainspring: steady output instead of one burst that burns a domain.
Pacing
Every mailbox has a ramp and a ceiling. Volume rises only as fast as inbox placement allows.
Circuit breakers
Bounce or complaint rates over your threshold pause sending on that domain until the cause is fixed.
Claims check
Every draft is checked against your claims library before it's sent. Unsupported claims are cut.
Stop on reply
A reply on any channel stops the sequence for that person straight away.
Compliance
An opt-out in every email, honored immediately. CAN-SPAM rules, plus the stricter rules for EU, UK and Canadian contacts.
Approval gates
Require sign-off on new sequences, new personas or every message, and loosen them as you build trust.
Four numbers. No vanity metrics.
Open rates stopped meaning much once mail clients started pre-loading images. Mainspring reports what connects to revenue.
Replies that show interest, as a share of people contacted.
Meetings that actually happened, not just booked.
Meetings your team qualified into a real opportunity in the CRM.
The early warning that protects deliverability for every future send.
Questions we get
How long does setup take?
The decisions in the winding stage usually take a few working sessions. Sending domains then need a few weeks of warm-up before they can carry real volume, and the agents build lists and draft sequences during that time.
What does Mainspring connect to?
Your CRM and your calendar, plus the sending domains and mailboxes it sets up. Agents get access only to what their job needs.
Can we review messages before they go out?
Yes. Approval gates can require sign-off on every message, on new sequences only, or not at all. Most teams start strict and loosen the gates as they see the output.
What happens when someone replies?
The sequence stops for that person. The replies agent answers routine questions and objections from your approved material, and passes real interest to booking or to a person on your team.
Wind it once. Let it run.
Early access is open to a small number of technical B2B companies. Tell us who you sell to and we'll tell you whether Mainspring fits.