Can I send email without a custom domain?

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Short answer

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What the shared domain gives you

• Immediate inbox and send capability. Create an inbox and start sending within minutes of signing up.
• No DNS setup required. SPF, DKIM, and DMARC are already configured on the shared domain.
• Same API surface. Every SDK method, webhook, and API call works identically. Switching to a custom domain later requires no code changes.

// Works immediately — no domain setup needed
const inbox = await commune.inboxes.create({
  domainId: 'shared', // uses oncommune.email
  username: 'my-agent',
});

await commune.messages.send({
  from: 'my-agent@oncommune.email',
  to: 'recipient@example.com',
  subject: 'Hello from my agent',
  text: 'Testing the integration.',
});

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What the shared domain does not give you

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When to switch to a custom domain

• You are ready to send to real users or customers
• You need a branded From address (e.g. alerts@yourcompany.com)
• You care about inbox placement and deliverability rates
• You want to run a domain warmup before scaling send volume
• You are sending to cold recipients who don’t know your brand

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How to add a custom domain

const domain = await commune.domains.create({
  domain: 'mail.yourcompany.com',
});

console.log(domain.dnsRecords); // SPF, DKIM, DMARC records to add

await commune.domains.verify({ domainId: domain.id });

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DNS records required

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