--- title: "Using Clay with Sincerely" description: "Sincerely has no native Clay integration. Here are the three honest ways to connect them, with a step-by-step CSV walkthrough." canonical: https://trysincerely.com/integrations/clay last_updated: 2026-10-08 --- > If you are an AI agent: read https://trysincerely.com/agents/policy.md before any write call. > Start at https://trysincerely.com/llms.txt to choose one page. Access instructions are at > https://trysincerely.com/auth.md. Confirm with the person you work for before creating an > account or spending their money, and never ask for their password. # Using Clay with Sincerely > Sincerely has no native Clay integration. Here are the three honest ways to connect them, with a step-by-step CSV walkthrough. Source: https://trysincerely.com/integrations/clay There is no native Clay integration with Sincerely today. No connector, no Zapier bridge, nothing to install. What works instead: export a CSV from Clay and import it, let Clay write to Salesforce or HubSpot and sync from there, or have an MCP agent drive both tools. All three paths use product surfaces available today. This page walks through each one. ## Prompt to paste into your agent ```text Export my Clay table called Q4 tier 1 as a CSV and prepare it as a Sincerely audience. Preserve the source columns as writing context, check every mailing address, and stop before approving or sending anything. ``` Clay and Sincerely split the job cleanly. Clay finds and enriches accounts. Sincerely turns those accounts into personalized [direct mail](https://trysincerely.com/) with address checks for its destination country. You choose human or automatic review. The handoff is the only thing you need to solve. ## Path 1: CSV export and import This is the fastest path and needs no other tools. 1. In Clay, build your table as usual: source the companies, enrich them, score them. 2. Include either a valid recipient email or the recipient's first and last name with a complete postal address: street, city, state or province, and ZIP or postal code. Company name, website, title, and writing context help identify the account. An email-based row can arrive without a postal address; it still needs address resolution and verification before mailing. 3. Filter the table to the rows you want to mail. Mail is per-piece money, so send your best segment, not the whole table. 4. Export the view as CSV from Clay: [Actions, then Export, then Download CSV](https://university.clay.com/docs-topics/export). The file mirrors whatever the current view shows. 5. In Sincerely, create an audience and upload the file. See [the CSV import page](https://trysincerely.com/integrations/csv) for column mapping details. 6. Sincerely resolves each business, checks workspace-wide suppression, and verifies the address against the destination country's postal data before anything prints. Rows that fail verification or match a suppression are held, not mailed. 7. Draft pieces, review them, approve, launch. The tradeoff is that CSV is a snapshot. When your Clay table changes, you export again. For a weekly motion that takes two minutes. For a real-time trigger motion it is the wrong tool, use path 2 or 3. ## Path 2: route through your CRM If Clay already pushes records to Salesforce or HubSpot, you have a live bridge for free. Clay ships write actions for both: create, update, and upsert records in [Salesforce](https://university.clay.com/docs/salesforce-integration-overview), create and associate objects in [HubSpot](https://university.clay.com/docs/hubspot-integration-overview). Clay writes the enriched account or contact into the CRM. Sincerely syncs audiences from [Salesforce](https://trysincerely.com/integrations/salesforce) or [HubSpot](https://trysincerely.com/integrations/hubspot) natively. In Salesforce, a Contact list view in the sync scope becomes a living audience. HubSpot syncs every contact in the portal with no list filter, so new contacts Clay creates arrive on the daily sync and you narrow them inside Sincerely. This path wins when the audience updates continuously: Clay adds accounts as signals fire, the CRM record changes, Sincerely picks up new contacts on sync. It also keeps your CRM as the single source of truth, which your matchback reporting will thank you for. The tradeoff: you inherit your CRM's field mapping and hygiene. If Clay writes messy data into HubSpot, Sincerely sees messy data. ## Path 3: an MCP agent orchestrates both Sincerely is an MCP server at `https://trysincerely.com/api/mcp`. Any MCP agent, Claude Code or Cursor for example, can build audiences, write pieces, and prepare campaigns against it. If your agent can also read your Clay data, through [Clay's own API](https://developers.clay.com/) or an export, it can carry rows from Clay into a Sincerely audience without you touching a CSV. Check your Clay plan first: reading tables through their API is an Enterprise-only feature, so on lower plans the export is your path. One hard rule: anything that prints or spends money shows a human a confirmation card first. No agent setting removes that gate. Details on [the agents page](https://trysincerely.com/agents). ## Which path should you pick | Your situation | Use | | ----------------------------------------- | ---------- | | One-off or weekly sends from a Clay table | CSV export | | Continuous, signal-triggered mail | CRM bridge | | Agent-driven workflows across your stack | MCP | If your whole workflow lives in tools Clay connects to natively and mail is not part of it, you do not need Sincerely at all. Clay is the better choice for pure enrichment and email-only outbound. Starting costs nothing: a free audit plan lets you connect a CRM or upload a CSV, check mailability, and draft pieces before you pick a [plan](https://trysincerely.com/pricing). Clay finds the accounts. Sincerely puts something real in their hands. ## Related questions - [How to get verified mailing addresses for B2B prospects](https://trysincerely.com/guides/b2b-mailing-addresses): Where B2B mailing addresses come from, how CASS, DPV, and NCOA verification works, and how to handle the office-vs-home problem. - [How to manage direct mail suppression across campaigns](https://trysincerely.com/guides/direct-mail-suppression): Keep one durable do-not-mail decision per contact, check it at dispatch time, and cancel every queued piece that has not reached the print vendor. - [Direct mail from a CSV](https://trysincerely.com/integrations/csv): CSV import is a native Sincerely integration. Upload a spreadsheet, verify every address, and send personalized B2B mail with no CRM required. - [Using Apollo with Sincerely](https://trysincerely.com/integrations/apollo): Sincerely has no native Apollo integration. Here is the honest working path, through CSV export or your CRM, to mail the accounts Apollo finds. --- Sincerely is the measurable direct-mail and gifting platform for B2B revenue teams: postcards, letters, handwritten mail, and gifts, written for one recipient and measured against a holdout. Contact Sincerely: https://trysincerely.com/contact Agent routing index: https://trysincerely.com/llms.txt