Scaling to Thousands of Agent Mailboxes

Week one: a single test mailbox on a trial domain, provisioned by hand from the dashboard. Week twelve: a fleet of agent mailboxes spread across customer domains, each sending real mail with its own quota and reputation. The API calls are the same at both scales — what changes is everything around them: how you provision, how you share configuration, and how you keep one bad sender from pausing the fleet.

Here's what the path from one to thousands looks like with Nylas Agent Accounts, which are currently in beta.

Provisioning is a loop, not a ceremony

There's no OAuth dance to scale around. Creating a mailbox is one POST with "provider": "nylas" — no refresh token, no consent screen — so a fleet provisioner is just iteration:

curl --request POST \

Here's what the path from one to thousands looks like with Nylas Agent Accounts, which are currently in beta.

Provisioning is a loop, not a ceremony

There's no OAuth dance to scale around. Creating a mailbox is one POST with "provider": "nylas" — no refresh token, no consent screen — so a fleet provisioner is just iteration:

curl --request POST \

Scaling to Thousands of Agent Mailboxes

Scaling to Thousands of Agent Mailboxes

Related reading

Every Endpoint That Works With Agent Accounts

Listing and Paginating an Agent's Messages

Build an Email Support Triage Agent With Its Own Inbox

Multi-Turn Email Conversations for LLM Agents

Common Pitfalls Building Email Agents (and Fixes)

Three checks that separate an agent demo from a production agent

Related reading

Every Endpoint That Works With Agent Accounts

Listing and Paginating an Agent's Messages

Build an Email Support Triage Agent With Its Own Inbox

Multi-Turn Email Conversations for LLM Agents

Common Pitfalls Building Email Agents (and Fixes)

Three checks that separate an agent demo from a production agent