Send transactional emails from a replyable mailbox with Nylas Agent Accounts

Nylas introduces Agent Accounts, a grant-backed mailbox that can both send and receive transactional emails, replacing no-reply addresses. This allows replies to OTPs, receipts, and security alerts to land in a real inbox, triggering webhooks for automated handling. The solution uses the same API as existing Nylas grants, simplifying integration for developers.