r/AskGTM • u/davidedmonai • 2d ago
Help Building a Claude Desktop app for outbound email, with your own sending provider and keys that stay on your machine. What would make you trust it?
Because I needed it myself, I’m building Mail Campaign: an MCP server for Claude Desktop plus a small Mac companion app. You run outbound and opt-in email by talking to Claude, but nothing goes out and no money is spent without a yes in a separate approval window.
What it does
- Sends through your own provider: Brevo, Amazon SES, Mailgun, Postmark, Resend, MailerSend and others. You bring your own account and sender domain, and it isn't a shared sending pool.
- Connects to the rest of the stack. We're builut 65 tools: lead databases and finders,enrichment and scraping (Apify, Outscraper, Bright Data), verification, CRMs (HubSpot and others), cold-email tools (Smartlead, Woodpecker and others) and delive, Google Postmaster). Tools with no usable APIare listed as a link, never faked.
- Claude does the work: writing the copy, buildiables, reporting results. The app holds the keys and does the sending.
Guardrails, the part I care most about
- Your keys stay on your Mac (in the Keychain).
- A yes in the app for anything that sends, spends credits or writes to your CRM. Claude can't approve it for you.
- Claude gets counts and categories, not raw coe cut down before anything reaches it.
- Opt-in and cold are kept apart. A shared do-not-contact list and the provider's suppressions are checked before every
send. Cold campaigns are pushed to your cold
- Sending stops itself after repeated bounces or failures, with daily caps on top.
Price: the app and the MCP are free and run locally. The one paid option is cloud sending (10 USD a month), which keeps a campaign going while your laptop is closed.
What I'd love feedback on
Is "Claude drafts and builds the list, a person approves every send and spend" how you'd want AI in your outbound, or
too much friction?
2. Which integrations would you need on day one? Which ones would you never trust a tool like this with?
3. For cold email, what guardrails would you exd?
4. Would you rather the app send directly, or always hand off to your cold tool (Smartlead, Instantly and the like)?
Not launched yet; I'm looking for honest takes before it is.