Buttondown Documentation

Buttondown Documentation

Alt text AMP API BIMI CAC CAN-SPAM act Captcha CFBL Cold email CORS CPM CSV CTA DKIM DMARC DNS Double opt-in Drip sequence ESP GDPR Gravatar Headless mode Hosting domain JAMStack JSON-LD LaTeX oEmbed Omnichannel OpenAPI Paywall Permanent failure POSSE Precedence: Bulk Preheader Rate sheet REST Reverse DNS RSS Sending domain Slug SMTP SpamAssassin SPF Temporary failure Transactional email UGC Webhooks Webmentions Whitelabeling WYSIWYG

© 2016–2025 Buttondown LLC.

CAC

CAC stands for "customer acquisition cost". It's a metric that measures how much it costs to acquire a new customer.

© 2016–2025 Buttondown LLC.