Buttondown Documentation
Dashboard
Editor
Subscriber management
Customization
Transactional emails
Archives
Deliverability
Exports
Automations
Events and webhooks
Advanced features
RSS-to-email
Analytics
Legal stuff
Glossary
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SMTP stands for "Simple Mail Transfer Protocol." It's the protocol used to send email over the Internet; when you send someone an email via Gmail (or your provider of choice), chances are it's going over SMTP.