MCP server for one.com mail:
every company mailbox, in Claude and ChatGPT
Running info@, sales@, support@ and invoices@ on your own domain at one.com? Connect each mailbox to one workspace and your AI agent works across all of them. Read, search, send, reply, schedule and organize mail over IMAP with the password you set when you created the address.
Claude cannot reach a one.com mailbox on its own. mcpemails is a hosted MCP server that connects it over IMAP at imap.one.com on port 993 and sends through send.one.com on port 465, authenticating with your full email address and the password you set for that account in the one.com Control Panel. Claude, Cursor or any MCP client can then read, search, send and organize the mail. There is no app password to generate. Each company address, such as info@ or sales@, connects as its own mailbox: one mailbox is free, Personal connects three and Pro every mailbox you run.
Several company mailboxes at one.com? See what each plan connects
How one.com connects: IMAP in, send.one.com out
one.com splits its two mail hostnames in a way that catches people out. Incoming mail is imap.one.com on port 993 with implicit TLS. Outgoing mail is send.one.com on port 465, also implicit TLS, with authentication required using the same credentials. Both are shared hosts covering every one.com customer, so nothing is derived from your own domain. The credential is the password you typed when the address was created in the Control Panel, alongside the part of the address before the at sign. That password is what both webmail and any mail client use, and it is separate from the login you use for the one.com Control Panel itself.
Microsoft 365 mailbox from one.com? Connect it with Outlook (Sign in with Microsoft)
The exact One.com IMAP and SMTP settings
Copy these into the connect form. mcpemails prefills them where it can, and retries the other standard transport if the first does not answer.
| Protocol | Server | Port | Security |
|---|---|---|---|
| IMAP (incoming) | imap.one.com | 993 | TLS (implicit) |
| SMTP (outgoing) | send.one.com | 465 | TLS (implicit) |
Verified 2026-08-31: imap.one.com answered a TLS connection and identified itself as an IMAP server under that name. It advertises LOGIN, PLAIN authentication.
Sign in with: Your full address, including the domain: name@yourdomain.com.
A One.com inbox your agent can actually use
Seventeen action-based MCP tools: send, reply, forward, schedule, and organize. Your agent finishes the job inside One.com.
- 01Read
Read & search mail
List, read and search across folders to find that invoice, summarize a thread, or pull the latest from a sender.
- 02Send
Send, reply & forward
Compose and send real messages, reply in-thread, and forward, directly from your mailbox, not as a draft you finish by hand.
- 03Schedule
Schedule for later
Queue a message to go out at the right time, so your agent can draft now and send on schedule.
- 04Organize
Move, copy, flag, archive, delete
Keep the inbox tidy: file mail into folders, flag what matters, archive the rest, or delete on request.
Connect One.com in four steps
From sign-up to first AI email in a couple of minutes.
Create your free mcpemails account
Sign up at mcpemails.com. The free plan connects one inbox forever and does not ask for a card.
Confirm the address exists and set its password
Log in to the one.com Control Panel and open the Email tile. The address has to be created there before any client can reach it. Click the address to edit it and set a password, or change the existing one. You can also change an email password from inside one.com Webmail once you are already signed in.
Paste it into mcpemails
Choose IMAP / SMTP, enter the full address, and paste the email account password. The hosts imap.one.com and send.one.com and ports 993 and 465 are prefilled and were verified from a live TLS connection.
Paste the MCP URL into your AI
Drop https://mcpemails.com/api/mcp into Claude, Cursor or ChatGPT, authorize, and your agent has the inbox.
Comparing providers first? See the email provider compatibility matrix
Every One.com mailbox your company runs, on one agent
If your company runs more than one address on One.com, such as info@, sales@ and invoices@, connect each one to the same mcpemails workspace. Your AI client then reaches all of them through the one MCP URL, in Claude, ChatGPT, Cursor or any other MCP client. Every tool call names the mailbox it acts on, each mailbox keeps its own sender name and signature, and a reply goes out through the mailbox it belongs to.
Free connects one mailbox, Personal three, and Pro every mailbox you run, on one login.
What actually goes wrong with One.com
The outgoing server is send.one.com, and smtp.one.com does not exist
Practically every other provider names its submission host smtp.something, so people fill that pattern in from muscle memory and get a hostname that does not resolve. one.com uses send.one.com. The asymmetry with imap.one.com makes it look like a typo in the documentation, and it is not. If reading mail works but sending times out or fails to resolve, this is the reason.
one.com also resells Microsoft 365, and that mailbox connects with Outlook
The Control Panel tile is labelled Email and Microsoft 365, and one.com sells both under the same account. A one.com email account, created in that tile with its own password, is an ordinary IMAP mailbox on one.com's servers and connects fine. A Microsoft 365 seat bought through one.com is a Microsoft mailbox on Microsoft's servers, so connect it with the Outlook option (Sign in with Microsoft) rather than IMAP. An IT admin may need to approve MCP Emails once first, and the dashboard gives you an approval link to send them. If your webmail is Outlook on the web rather than one.com's own interface, you have the Microsoft product.
Control Panel two-step verification does not reach your mailbox
one.com offers two-step verification on the Control Panel login. It protects the panel, where your domains and billing live, and it has no bearing on IMAP or SMTP, which continue to accept the email account password on their own. Turning it on will not break mcpemails, and it will not protect the mailbox either. If you want the mailbox itself secured, the lever is a strong, unique password on that address rather than the panel's 2FA.
Known limits with One.com
- The server does not advertise MOVE or UIDPLUS, so a move is carried out as copy, flag and expunge, and the destination UID has to be found by searching.
- SPECIAL-USE is absent, so Sent, Drafts, Trash and Junk are matched by name. Danish, Swedish and Norwegian one.com mailboxes often have localised folder names.
- Microsoft 365 seats sold through one.com are not on imap.one.com. Connect them with Outlook (Sign in with Microsoft) instead.
One.com and AI: common questions
Does Claude work with one.com email?
Not on its own. Claude has no built-in one.com connector. Pointing an MCP server such as mcpemails at your one.com mailbox over IMAP gives Claude read, search, send, reply, schedule and organize access to it, and the same connection works from Cursor, ChatGPT and other MCP clients.
What are the one.com IMAP and SMTP settings?
IMAP is imap.one.com on port 993 with implicit TLS. Outgoing mail goes to send.one.com on port 465, also implicit TLS, with authentication required. The username is your complete email address and the password is the one set for that account in the Control Panel. Both hosts were confirmed from a live TLS connection.
Why is my one.com password rejected?
Two usual causes. You are entering your one.com Control Panel login instead of the password set on the individual email account, or the address was never actually created in the Email tile of the Control Panel. Verify by signing in to one.com Webmail with the same credentials: if that fails too, the problem is the mailbox, not the client.
Does one.com need an app password?
No. one.com does not issue app-specific passwords for mail, and there is no per-mailbox IMAP switch to turn on. The email account password authenticates both IMAP and SMTP. Two-step verification on the Control Panel does not change that.
Is my one.com mail stored on your servers?
No. Messages are fetched live from one.com over IMAP for each request and handed to your AI client. Credentials are encrypted at rest and message bodies are not retained.
Can I connect several One.com mailboxes to the same AI agent?
Yes. Connect each One.com address to one mcpemails workspace and your AI client reaches all of them through the same MCP URL. Every tool call names the mailbox it acts on, so a reply to a message in sales@ goes out from sales@. Free connects one mailbox, Personal three, and Pro every mailbox you run.
Put every one.com mailbox on one agent
Connect your first one.com mailbox free, no card required. Personal connects three, Pro every mailbox you run.