Giving an SDR agent its own reply inbox with Nylas
How Nylas Agent Accounts let SDR agents own an inbox, classify replies and pause outbound sequences the instant a prospect responds.
Standard outbound tools make firing a five-step sequence trivial but go blind the moment a prospect replies, since responses land in a no-reply mailbox nobody reads — so "circle back in Q3" gets ignored and step four still ships two days later. This piece describes using a Nylas Agent Account to fix that: a grant the agent itself owns, letting it send and receive replies under one address without borrowing a human rep's OAuth or cluttering their personal inbox.
Architecturally, an Agent Account behaves exactly like any connected Gmail or Microsoft grant — same grant_id, same /v3/grants endpoints. What changes is the control plane: you provision the mailbox yourself on your own domain, with no human refresh token to manage. Because Agent Accounts can't attach custom metadata to messages, sequence state (who's on which step, who replied, who's paused) has to live in your own database — the email is just the message, your app is the state machine.
The real payoff is that inbound replies trigger the standard message.created webhook, letting you pause a sequence the instant a prospect responds. Webhooks are subscribed at the app level, not per grant, so one endpoint receives events for every Agent Account, filtered by grant_id. Classification of replies — pricing request, snooze, unsubscribe — is left to your own LLM or rules; Nylas just delivers mail, it doesn't interpret intent, and keeping that boundary clear is central to building this correctly.