# MCPmailer vs Nylas

Nylas connects to mailboxes your users own, and now hosts agent accounts too. MCPmailer gives agents their own address on your domain.

Also searched as: Nylas alternative, Nylas Agent Accounts, connected accounts vs agent inboxes.

## What Nylas is

Nylas is the long-standing answer to "let my product read and send from my users' Gmail and Outlook": one API across many providers, with calendar and contacts alongside mail. In 2026 it added Agent Accounts, Nylas-hosted mailboxes for agents, which brings it into this category from the other direction.

## Where Nylas is the better choice

If your product needs to act inside a mailbox a human already owns, including their calendar and contacts, Nylas is the right tool and we are not a substitute. We do not connect to existing Gmail or Outlook accounts at all, by design.

## Where MCPmailer differs

When the agent needs an identity of its own rather than borrowed access to a person's, the connected-account model stops helping and starts charging: consent flows, token refresh, per-provider quirks, and a per-account fee on top of the mailbox licence you already pay. An address on your own subdomain with a scoped key has none of that.

### No OAuth flow for an unattended agent

Connected accounts assume a human is present to consent, at least once, and to re-consent when a token is revoked or a policy changes. A key scoped to one mailbox has no such moment. For a background agent that has to keep working at 3am on a Sunday, that is the difference between reliable and eventually broken.

### Blast radius of one address

Delegated access means a confused agent is loose in a person's mailbox, with their history and their contacts. Ours can only reach its own mailbox, and other identities in the workspace are invisible to it unless access was granted. When something goes wrong, the containment is structural rather than procedural.

### Priced per conversation, not per account

The connected-account ladder charges per mailbox attached, and you still pay the provider for the underlying seat. We charge for a base plan plus the mail that actually moves, so ten agents that each send a hundred messages cost what a hundred messages cost, not what ten accounts cost.

## Which side of the line are you on

This is a design decision more than a vendor decision, and it usually splits cleanly.

1. **Acting as a user** Stay with Nylas. If the agent must send from a named person's mailbox and see their calendar, nothing here replaces that.
2. **Acting as itself** Come over. A support, sales, or scheduling agent that writes as the company wants its own address, not a borrowed one.
3. **Both, which is common** Read a user's calendar through Nylas, then have the agent negotiate the meeting from its own address here.

## Side by side (checked July 2026)

| | MCPmailer | Nylas |
| --- | --- | --- |
| Built for | Agents holding conversations, reached over MCP first and HTTP second. | Connecting to mailboxes users already own, plus hosted agent accounts. |
| Inbox per agent | One mailbox per agent, created from the dashboard or the API, each with its own scoped key. | Yes, via Agent Accounts. Historically one connected account per human. |
| Receiving and threading | Inbound MX, parsed MIME, In-Reply-To threading. The whole conversation stays queryable. | Yes, across providers, behind a unified model. |
| MCP server | Native. Streamable HTTP with a bearer key, or OAuth 2.1 for clients that cannot hold one. | API and CLI first. |
| Waiting for a reply | wait_for_reply long-polls the mailbox until the other side answers, up to five minutes per call. | Webhooks and sync. No blocking wait tool. |
| Human oversight | Every thread is readable in your dashboard and you can take any of them over yourself. | Admin tooling around connected accounts. |
| Sending limits | Reply-first rather than one flat number: answering a customer is never rationed against cold outreach. | Bound by whatever the underlying provider allows. |
| Your domain | Instant you.mcpmailer.email subdomain, then verify agents.yourcompany.com with a guided DNS wizard. | Nylas-hosted, or the connected account's own domain. |
| Search | Full-text search across the workspace, exposed to the agent as search_inbox. | Provider-backed search. |
| Beyond the inbox | The whole workspace: contacts the agent remembers facts about, notes, a vault it can read secrets from, and a tunnel hostname. | Calendar and contacts from the connected provider, which is a real advantage if you need them. |
| Free tier | 3,000 emails a month, 100 a day, 3 inboxes, no card. | Trial and sandbox rather than a standing free allowance. |
| Content privacy | We never read message content and never train on it. Enforcement is behavioral and metadata only. | Processes message content to build the unified model. |

## Questions

### Can MCPmailer read my Gmail?

No, and that is deliberate. Your agent gets its own address instead of access to a person's inbox, which keeps the blast radius of a mistaken agent to one mailbox. If you need to act inside a human's mailbox, use Nylas.

### How does MCPmailer compare to Nylas Agent Accounts?

Same idea, different centre of gravity. Their published shape is a platform base fee that includes a number of agent accounts, then a small per-account price. Ours is a base plan plus metered mail, with MCP as the native interface and a supervision dashboard included.

### Do you support calendars?

No. If calendar access is essential, keep Nylas for that and let the agent converse from an address here.

### What about Outlook and Microsoft 365?

Same answer as Gmail: we do not connect to them. See the Microsoft 365 comparison for why an agent usually wants its own address anyway.

All comparisons: https://mcpmailer.com/vs
Docs: https://mcpmailer.com/docs.md
Pricing: https://mcpmailer.com/pricing.md