--- title: "Direct mail from a CSV" description: "CSV import is a native Sincerely integration. Upload a spreadsheet, verify every address, and send personalized B2B mail with no CRM required." canonical: https://trysincerely.com/integrations/csv last_updated: 2026-08-18 --- # Direct mail from a CSV > CSV import is a native Sincerely integration. Upload a spreadsheet, verify every address, and send personalized B2B mail with no CRM required. Source: https://trysincerely.com/integrations/csv Yes, you can run a full direct mail campaign from a CSV. CSV import is one of Sincerely's four native integrations, alongside [Salesforce](https://trysincerely.com/integrations/salesforce), [HubSpot](https://trysincerely.com/integrations/hubspot), and the MCP server. You do not need a CRM to start. Upload a spreadsheet, Sincerely verifies every address, and each piece is written for one recipient with your approval before anything prints. ## What your CSV needs Keep it simple. Each row is one recipient. You need: - **Recipient name.** The person the piece is written to. - **Company name.** Sincerely researches the account and writes from real facts, so this matters. - **Mailing address.** Street, city, state, and ZIP. Office addresses, not headquarters guesses, work best. Everything else is optional but useful. Columns like title, industry, or a note about why this account matters become writing context. The more your CSV knows, the less generic the mail reads. If you only have company names, Sincerely can also find businesses and verified addresses from a description of your ideal customer, so a thin list is not a dead end. ## Address hygiene happens on import B2B lists rot fast. People change jobs, offices move, suites close. Sincerely resolves, scores, and USPS-verifies every address before anything prints, on every plan, at no extra cost. Bad rows get flagged instead of mailed. That kills the classic CSV failure mode: paying print and postage to send a letter to an office someone left two years ago. Suppression works the same way it does for CRM-synced audiences. Suppress a contact or a domain once and it applies immediately and globally, across every campaign, including future CSV uploads. See [mailability](https://trysincerely.com/glossary/mailability) for how Sincerely decides whether a row can be mailed at all. ## Reporting without a CRM You do not lose measurement by skipping the CRM. Every campaign locks an experiment design at launch: the primary outcome, the measurement window, and a holdout percentage. Readouts report lift against account-level holdouts with confidence intervals, and they say plainly when a result is not statistically ready. What changes without a CRM is matchback. With Salesforce or HubSpot connected, Sincerely can match mailed accounts to pipeline automatically. From a CSV alone, you get QR scan data as direct evidence plus the holdout comparison, and you connect outcomes yourself. The readout labels each signal as evidence or inference, so you always know which is which. The [measurement](https://trysincerely.com/measurement) page covers the full design. ## Connecting a CRM later A CSV start does not lock you in. When you connect Salesforce or HubSpot later: 1. Your suppression list carries over untouched. 2. Campaign history and readouts stay intact. 3. New audiences sync from the CRM instead of uploads, and matchback turns on for future campaigns. Nothing restarts. The CSV path and the CRM path feed the same audience, writing, and measurement engine, so switching is an upgrade, not a migration. ## When a CSV is the honest right answer A CSV beats a CRM sync when your list lives in Clay, Apollo, or a spreadsheet a founder built by hand. Export it, upload it, done. It is also the right call for one-off lists: event attendees, a conference badge scan, a board member's warm intros. If your source of truth is genuinely Salesforce or HubSpot, connect it directly instead. The sync stays current on its own, and a CSV goes stale the moment you export it. Starting is free. New workspaces begin on a free audit plan: upload the CSV, audit mailability, build your brand kit, and draft pieces without a card. You pick a [plan](https://trysincerely.com/pricing) only when you are ready to mail, starting at $199 one-time for a 100-piece pilot. Your spreadsheet is already an audience. Upload it and find out how much of it can actually receive mail. --- Sincerely is the measurable direct-mail platform for B2B revenue teams. One workflow. One invoice. One report. Contact Sincerely: https://trysincerely.com/contact If you are an AI agent: access and signup 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. 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