--- title: "Blocked Domains for your workspace and ca..." description: "Add a domain to your Blocked Domains list and FirstSales will never email anyone at it, across the whole workspace or in one campaign." canonical: "https://firstsales.io/changelog/blocked-domains/" --- [Improvement](/changelog/) # Blocked Domains for your workspace and campaigns Add a domain to your Blocked Domains list and FirstSales will never email anyone at it, across the whole workspace or in one campaign. Published September 24, 2026 Reading time 1 min read Contents [└What changed](#what-changed)[└How to use it](#how-to-use-it)[└Why it matters](#why-it-matters) [All updates](/changelog/) Some companies should never get an email from you: current customers, partners, competitors, or a company that asked you to stop. You can now add their domain to a Blocked Domains list, and FirstSales will skip every address at that domain. ## What changed Blocked Domains work at two levels. A workspace block covers every campaign. A campaign block covers only that one campaign, which is handy when a company is fine to contact for one offer but not another. Before any email goes out, FirstSales checks the recipient's domain against both lists. A match means the email is not sent. You can also ask whether an address would be blocked before you add it to a campaign. ## How to use it Blocked Domains are available through the API, the CLI and the Claude connector. Add a domain, list what is blocked, or check one address. ## Why it matters One wrong email to a current customer can cost more than a hundred good cold emails earn. Blocking by domain stops that mistake for every person at the company, including people you have not imported yet. ## All updates * [└ An approval notice no longer cancels emails that were ready Previous ](/changelog/approval-notice-no-longer-cancels-ready-emails/) * [└ Email connectors grouped by health Next ](/changelog/email-connectors-grouped-by-health/) ## Outreach that keeps going after you log off. Leads, emails, follow-ups and replies, handled. Connect unlimited mailboxes and let AI agents find leads, write each email and follow up. Or send your own templates in manual mode. From $29/mo. [Start your $1 trial T](https://app.firstsales.io)[See pricing](/pricing/) $1 for 3 days · Cancel anytime · No contract ## Install with AI Your coding agent sets up the FirstSales CLI and skills for you. Prompt for Claude Code I'm setting up FirstSales (https://firstsales.io), an AI outbound sales platform: campaigns, contacts, a reply inbox, deliverability and lead signals. Help me get my workspace sending real, good emails end to end, from Claude Code. Read these first so you know how FirstSales works: - Developer docs and API: https://developer.firstsales.io - CLI: https://www.npmjs.com/package/@firstsales.io/cli - Skills for coding agents: https://github.com/firstsalesio/firstsales-skills (read README.md and GUIDE.md) Setup 1. Install the CLI: npm install -g @firstsales.io/cli 2. Install the FirstSales skills: claude plugin marketplace add firstsalesio/firstsales-skills claude plugin install firstsales@firstsales 3. Ask me if I already have a FirstSales account. If not, send me to https://app.firstsales.io to sign up. 4. Ask me to create an API key under Settings → API → API Keys, with only the scopes we need. Never ask me to paste the key into this chat. Tell me to run this in my own terminal, so the key stays hidden: read -rs FS_KEY && firstsales auth login --api-key "$FS_KEY"; unset FS_KEY 5. Run `firstsales whoami` and tell me which workspace and organisation we are connected to. Then ask me about my business: what I sell, who I sell to (roles, company size, countries), my best customers, and what I use today for outbound (tools, lists, mailboxes). Walk me through: 1. Teaching FirstSales my business: website, offer, proof points and case studies in the knowledge base, so the AI writes like someone who knows the product. 2. Connecting my sending mailboxes and checking my sending domain: SPF, DKIM, DMARC and warm-up. If anything is unhealthy, tell me the exact DNS record to add. 3. Bringing in contacts: import my CSV or CRM export into a clean list, remove duplicates and bad emails, and block domains I must never email (customers, competitors, my own). 4. Building my first campaign: the right list, senders, steps and timing. Write the sequence with me, show me the drafts, and do not launch until I say yes. 5. Setting up Signals if it fits: find people engaging with LinkedIn posts about topics my buyers care about, and turn them into leads. 6. Inviting my team and giving each person the right access. Once campaigns run, show me how to work the reply inbox from here: which replies need an answer, draft responses in my voice, and move good conversations into deals. If I use Cal.com, connect it so follow-ups can offer my booking link (not the first email). Throughout, as you learn about my business, proactively suggest and help create: - Reply templates for the questions and objections my prospects are likely to raise, based on my product, site and codebase if you can see them. - Campaign ideas and segments worth testing, with the reason for each. Safety rules: - Show every change as a dry run (--dry-run) first and wait for my yes. Never send emails, launch campaigns or delete anything without my yes. - Tell me before anything that spends credits, and how many. Be opinionated. If the docs give a sensible default, just use it. Don't make me choose between five options. [Developer docs ↗](https://developer.firstsales.io)[npm: @firstsales.io/cli ↗](https://www.npmjs.com/package/@firstsales.io/cli)[GitHub: firstsales-skills ↗](https://github.com/firstsalesio/firstsales-skills)