Product overview
The cold-email workflow, built to switch and automate.
MailSequence brings business inboxes, DNS setup, warmup, verification, sequences, rotation, replies, and automation into one focused platform for agencies and lean outbound teams.
Follow the complete setup-to-reply workflow →
Bring or buy business inboxes·API on every plan·Staged migration support
Complete workflow
From sending infrastructure to qualified replies.
Keep the data and CRM tools your team already uses. MailSequence handles campaign sending, replies, and the controls around them.
Connect or buy inboxes
Authorize Google Workspace or Microsoft 365 synchronization and verify SMTP sending readiness, or purchase configured business inboxes in-product.
Authenticate domains
Use the Cloudflare-based setup path for nameserver delegation and authentication records, then verify the resulting DNS before sending.
Transfer or build
Check Smartlead or Instantly source compatibility before transferring supported records, or create a sequence from scratch.
Verify and enroll
Verify contacts before sending, preserve suppression decisions, and enroll the right audience.
Warm and rotate
Ramp inboxes progressively and distribute sending through campaign pools with conservative limits.
Handle replies
Work from a unified inbox, stop follow-ups on reply, and monitor replies, bounces, and health.
Why MailSequence
Four reasons to switch.
Switch one campaign at a time
Use your authorized Smartlead or Instantly API key for a compatibility check, then transfer supported records and reconnect senders before launch.
A workspace for every client
Keep client data isolated, manage organization-level connections, apply role-based access, and automate onboarding through the provisioning API.
A real API on every plan
Use a versioned REST API, public OpenAPI documentation, scoped keys, idempotent writes, signed webhooks, and hosted MCP.
Practical sending safeguards
Combine authenticated business inboxes, domain setup, verification, warmup, rotation, suppression, and conservative limits. Placement still depends on mailbox providers and recipient response.
Capability map
What the product covers.
| Operating job | MailSequence capability | Boundary |
|---|---|---|
| Mailbox setup | OAuth synchronization plus SMTP readiness, or included provisioned inboxes | Additional inboxes cost extra |
| Domain authentication | Cloudflare-based SPF, DKIM, and DMARC setup path | Verify the resulting records before sending |
| Audience preparation | CSV/API import, verification, lists, suppression | Connect your chosen prospect data source |
| Campaign operation | Sequences, schedules, pools, limits, stop-on-reply | No LinkedIn or dialer workflow |
| Reply operation | Unified threads, tagging, assignment, response drafts | Not a full sales CRM |
| Automation | REST API, webhooks, MCP, provisioning | Plan and rate limits apply |
| Measurement | Sends, replies, bounces, unsubscribes, health | No open-rate claims |
Connect MailSequence to your existing sales stack. Keep Apollo, Clay, or your CRM where they fit. Use supported connections and the public API for automation.
FAQ
Frequently asked questions
How does MailSequence fit into an existing sales stack?
MailSequence handles business email campaigns, sender controls, and reply management. It connects with customer-owned data and CRM tools, so teams can keep their preferred prospecting and sales systems around it.
Can I provision inboxes inside MailSequence?
Yes. Every plan includes a defined provisioned-inbox allowance with no markup on that allowance at launch. You can also authorize synchronization for supported inboxes you already own. Additional provisioned inboxes cost extra.
What can I transfer from Smartlead or Instantly?
Start with a read-only compatibility check using your authorized source API key. The exact campaign, sequence, lead, account-metadata, and block-list records available must be confirmed against the current source API before transfer.
Is the developer platform available on Starter?
Yes. The public REST API, signed webhooks, and hosted MCP server are available on every plan. Plan capacity and rate limits still apply.
Does MailSequence guarantee inbox placement?
No. MailSequence supports authentication setup and provides verification, warmup, rotation, suppression, limits, and health controls. Domain history, list quality, copy, volume, and recipient behavior still affect delivery.
Run the cold-email workflow in one focused platform.
Choose a plan, connect or purchase business inboxes, and build or assess your first campaign.