--- title: "Integrations" description: "Salesforce and HubSpot contacts, accounts, and opportunity outcomes sync in. Eligible delivery events raise rep follow-up tasks. No CRM? A CSV works." canonical: https://trysincerely.com/integrations last_updated: 2026-10-05 --- > 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. # Integrations > Salesforce and HubSpot contacts, accounts, and opportunity outcomes sync in. Eligible delivery events raise rep follow-up tasks. No CRM? A CSV works. Source: https://trysincerely.com/integrations ## Signals in. Follow-up out. Salesforce and HubSpot contacts, accounts, and opportunity outcomes sync in. Eligible delivery events raise rep follow-up tasks. Your team keeps working where it already works; mail becomes another motion inside it. Salesforce · HubSpot · CSV | Item | Detail | | ------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | What syncs in | Contacts, their accounts, and supported opportunity fields. Salesforce lets you scope contacts by list view, owner, title, or geography. HubSpot syncs every eligible contact in the portal with a documented set of standard fields. The only custom fields either one reads are a renewal date you map and a field you choose to sign a touch with. | | What flows out | Rep follow-up tasks in Sincerely's own queue, created from confirmed delivery events where the production partner returns them. Salesforce admins can optionally write those tasks back. Results tie to mailed accounts in the report. | | Customer lifecycle | A newly observed closed-lost opportunity can trigger an approved revival flow. Other lifecycle signals can enter through a reviewed CSV or sourced audience when they are outside the native CRM field set. [See how the programs support customer relationships.](https://trysincerely.com/customer-relationships) | | Delivery tracking | Eligible postal confirmations stream back piece by piece. Other formats keep their fulfillment state without inventing a delivery event. | | No CRM yet | A CSV works. You get engagement reporting and delivery reporting where available, honestly labeled, and can connect the CRM later without starting over. | ## Every page in this collection - [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. [Markdown](https://trysincerely.com/integrations/apollo.md) - [Send physical mail from Claude](https://trysincerely.com/integrations/claude-mcp): Connect Claude to Sincerely and send real B2B direct mail. Claude Code takes one command, claude.ai takes a connector, and a human confirms every print. [Markdown](https://trysincerely.com/integrations/claude-mcp.md) - [Using Clay with Sincerely](https://trysincerely.com/integrations/clay): Sincerely has no native Clay integration. Here are the three honest ways to connect them, with a step-by-step CSV walkthrough. [Markdown](https://trysincerely.com/integrations/clay.md) - [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. [Markdown](https://trysincerely.com/integrations/csv.md) - [Send physical mail from Grok](https://trysincerely.com/integrations/grok): Grok connects to Sincerely through a custom MCP connector on web, iOS, or Android. It drafts B2B mail a human confirms before anything prints. [Markdown](https://trysincerely.com/integrations/grok.md) - [HubSpot direct mail and handwritten notes integration](https://trysincerely.com/integrations/hubspot): Start printed or handwritten mail from HubSpot deals and renewal dates. Trigger recipes, the field mapping, setup steps, and what the read-only sync leaves out. [Markdown](https://trysincerely.com/integrations/hubspot.md) - [How to send direct mail from your AI agent](https://trysincerely.com/integrations/mcp-agents): Claude, Codex, Cursor, Hermes, or any MCP agent can build an audience, draft a piece, and request a send through Sincerely. A human confirms first. [Markdown](https://trysincerely.com/integrations/mcp-agents.md) - [Using Outreach with Sincerely](https://trysincerely.com/integrations/outreach): Sincerely has no native Outreach integration. Here is the honest way to add direct mail to your Outreach sequences through your shared CRM. [Markdown](https://trysincerely.com/integrations/outreach.md) - [Salesforce direct mail and handwritten notes integration](https://trysincerely.com/integrations/salesforce): Send printed mail or handwritten notes when a Salesforce deal closes lost, goes quiet, or nears renewal, with follow-up Tasks written back to Salesforce. [Markdown](https://trysincerely.com/integrations/salesforce.md) - [Using Salesloft with Sincerely](https://trysincerely.com/integrations/salesloft): Sincerely has no native Salesloft integration. Your CRM is the bridge. Here is the honest setup, step by step, and where it falls short. [Markdown](https://trysincerely.com/integrations/salesloft.md) - [Zapier direct mail integration: webhooks and CRM paths](https://trysincerely.com/integrations/zapier): Sincerely has no Zapier app. A Zap can still start a handwritten note or printed piece through a webhook to the Sincerely API, or through your CRM. [Markdown](https://trysincerely.com/integrations/zapier.md) --- Sincerely is personalized direct mail and gifting for B2B revenue teams: postcards, letters, handwritten mail, and gifts, each written for one recipient. Contact Sincerely: https://trysincerely.com/contact Agent routing index: https://trysincerely.com/llms.txt Listings: https://www.g2.com/products/sincerely and https://www.producthunt.com/products/sincerely