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Requires Starter plan or above.

Setup

1. Register your domain via API

curl -X POST https://api.postlark.ai/v1/blogs/BLOG_ID/domain \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"hostname": "blog.yourdomain.com"}'

Or use Dashboard → Settings → Custom Domain.

2. Add a CNAME record

At your DNS provider, add:

CNAME   blog   →   your-slug.postlark.ai

3. Wait for propagation

DNS changes can take up to 48 hours, but usually complete within minutes. Check status:

curl https://api.postlark.ai/v1/blogs/BLOG_ID/domain \
  -H "Authorization: Bearer YOUR_API_KEY"

SSL

SSL certificates are automatically provisioned via Cloudflare. No action needed.

Subdomain Redirect

Once a custom domain is active, your slug.postlark.ai subdomain automatically redirects (301) to your custom domain.

SEO

• Custom domain blogs are indexed by Google (Starter+)
• Free subdomain blogs are noindex by design
• canonical URL automatically points to your custom domain