The original title is about sending auth and transactional email from a replyable mailbox. Let me rewrite this as a punchy headline.

Short summary

A tutorial on replacing no-reply@ transactional emails with Nylas Agent Accounts that can both send and receive. Agent Accounts are grant-backed mailboxes provisioned via API without OAuth, enabling replies to auth emails, OTPs, and receipts to land in a real inbox with webhooks. The post includes curl and CLI examples and honestly notes that dedicated ESPs still win for high-volume one-way marketing blasts.

• •Agent Accounts enable replyable transactional and auth email without OAuth
• •Same grant_id works for send and receive, with automatic threading and webhooks
• •Honest tradeoff: dedicated ESPs still better for high-volume one-way marketing

Generated with AI, which can make mistakes.