--- 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: 2026-08-31 --- > 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 imports a fixed, documented field set. | | 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 and Claude Desktop take a custom connector, and a human confirms before anything prints. [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) - [Send physical mail from OpenAI Codex](https://trysincerely.com/integrations/codex): Point Codex at Sincerely's MCP server with a three-line config block and an OAuth login. Codex builds audiences and drafts B2B mail; a human confirms before anything prints or spends. [Markdown](https://trysincerely.com/integrations/codex.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 supports custom MCP connectors on web, iOS, and Android. Add Sincerely's server URL and Grok can build B2B mail audiences and draft pieces, with a human confirming every send. [Markdown](https://trysincerely.com/integrations/grok.md) - [Send physical mail from Hermes](https://trysincerely.com/integrations/hermes): Hermes models cannot send mail alone, but Hermes Agent from Nous Research is an MCP client. Add Sincerely's server to its config and it prepares B2B mail a human confirms before printing. [Markdown](https://trysincerely.com/integrations/hermes.md) - [HubSpot direct mail: automate mail from your CRM](https://trysincerely.com/integrations/hubspot): Sync contacts, companies, and properties from HubSpot, write each piece from CRM context, approve before anything prints, and time rep follow-up to confirmed delivery. Lift is measured against account-level holdouts. [Markdown](https://trysincerely.com/integrations/hubspot.md) - [How to send direct mail from your AI agent](https://trysincerely.com/integrations/mcp-agents): Connect Claude, Cursor, or another MCP agent to build an audience, draft a piece, and request a send, with human confirmation before money is spent. [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: automate mail from your CRM](https://trysincerely.com/integrations/salesforce): Sync accounts and contacts from Salesforce, write each piece from CRM context, approve before anything prints, and time rep follow-up to confirmed delivery. Lift is measured against account-level holdouts. [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) - [Using Zapier with Sincerely](https://trysincerely.com/integrations/zapier): There is no Sincerely Zapier app today. Here is the honest path, route data through Salesforce, HubSpot, or a CSV, and let Sincerely take it from there. [Markdown](https://trysincerely.com/integrations/zapier.md) --- 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