Email APIs are now generally available

The Email APIs have graduated from BETA and are now generally available. This includes four endpoints:

• Emails::Broadcast — Create, manage, and send email broadcasts
• Emails::Settings — Read your workspace's configured system and marketing from/reply-to addresses
• Emails::Template — Manage email templates used by broadcasts
• Emails::Topic — Manage email topics for subscriber preference management

All endpoints are now stable and ready for production use.