Read and search
Lists the inbox, searches by sender, subject, text or dates, and reads a specific email. Reading does not mark the email as read, move it or delete it.
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Connectors for Claude
Work your email with Claude, without handing your password to anyone.
eSynapsing Mail is a local connector that lets Claude read and draft email from your accounts: Microsoft 365 (Outlook), Gmail with an app password and any IMAP/SMTP server. Your email lives on each computer, not in the Claude account. We install it and set it up with your company’s branding and Microsoft app.
The problem
Email is where the work piles up, and Claude cannot reach it
Companies that already use Claude use it with documents, but email stays outside: it is copied and pasted by hand, or a mailbox is connected to the Claude account, which is often the whole company’s.
Full mailboxes: long threads to read, filter and summarise every day.
Copying and pasting emails into the chat is slow and loses context and attachments.
The official Microsoft 365 connector links a single mailbox to the Claude account; if the account is shared, each person’s mailbox does not fit.
Sharing passwords or giving a tool full access is not acceptable for client data.
Our answer
A local connector, with brakes, for each person
eSynapsing Mail runs on each user’s computer: each person sets up their own accounts and Claude only accesses them when they ask.
Draft and send
Claude can save a draft in the Drafts folder or send the email, always showing you the message and asking for confirmation before sending. It adds your signature (the classic Outlook one if found).
Outlook archives (.pst)
Searches and reads old email from .pst archives, read-only, without opening Outlook.
Several accounts
Microsoft 365 and password accounts (IONOS, OVH, Strato, Hostinger, Zoho, cPanel, own Exchange, Gmail with an app password) live together in the same connector.
With your branding
Each company gets its own variant: with its Microsoft 365 app, its logo and colours and its parameters.
How it works
How eSynapsing Mail works
1
We prepare your variant
We define domain(s), account types and branding. If you use Microsoft 365, your administrator registers an app in Entra ID (once) and gives us the identifiers.
2
We install it
We install the connector in Claude Desktop (.mcpb extension) or in Codex / Claude Code, and keep it updated when a new version comes out.
3
Each person adds their email
From a local setup page they add their account. With Microsoft 365 they sign in in the browser with their user and a code; they never type the password into the chat.
4
Ask Claude
“Summarise what came in today”, “Draft a reply to this supplier”. Claude checks the mailbox and asks for your confirmation before sending anything.
Requirements
What you need to use it
Computers running Windows (password encryption uses the Windows secure store).
Claude Desktop or Codex / Claude Code. Claude Desktop does not require installing Node.
Microsoft 365: an administrator must register an app in Entra ID and grant the permissions once.
IMAP/SMTP accounts: server details and password (or app password, in the case of Gmail).
Security and data
How we protect your data
IMAP/SMTP account passwords are stored encrypted with the Windows key store (DPAPI) inside the user’s profile, and are never requested or shown in the chat. Microsoft 365 sessions are stored encrypted (AES-256-GCM) with a key specific to each Windows user. The setup page only listens on the local computer (127.0.0.1). With Microsoft 365 the connector uses delegated permissions: it can only access the mailbox of the person who signed in. Brakes inside the connector: a list of allowed recipient domains, a maximum number of recipients and of sends per day, an authorised folder for attachments and a local send log (date, account, recipients, subject and attachment names; not the message body). Received emails are treated as untrusted content: Claude summarises or quotes them, but does not follow their instructions. Important: when you ask Claude to read an email, its text goes into the conversation with Claude, just like any other text you give it.
Frequently asked questions
What people ask us about eSynapsing Mail
If you have a question you don't see here, write to us and we'll reply as soon as possible.
Does it work with Outlook / Microsoft 365 email?
Yes. It uses Microsoft Graph with delegated permissions; a Microsoft 365 administrator needs to register an app and grant the permissions once. Password accounts (IONOS, OVH, Gmail with an app password, etc.) work directly.
Why not use Claude’s official Microsoft 365 connector?
That one links the mailbox to the Claude account: if the company has a shared account, it cannot connect one mailbox per person. eSynapsing Mail runs on each computer and the identity comes from the Windows user, not from the Claude account.
Can Claude send emails without me knowing?
No. Before sending, Claude must show the sender account, recipients, subject, body and attachments and get your explicit confirmation. The connector also applies its own limits (allowed domains, maximum recipients, sends per day) and logs every send. If you only want to review, it can leave it as a draft.
Where are passwords stored and what does Claude see?
Passwords are encrypted on your computer with Windows; they are not requested in the chat. The connector reads email only when you ask, and the text of the emails it reads goes into the conversation with Claude.
Does it work on mobile or Mac?
Only on Windows, for now. On mobile it works if the computer is on and Claude Desktop is open. Server mode and Mac are not available.
How is it installed and who updates it?
We install it on each machine, with your branding and, if needed, your Microsoft app, and update it when a new version is released. Accounts already set up are kept.
See it in action
Want Claude to work with your company’s email?
Tell us which accounts you use and how many computers, and we will prepare the connector variant with your branding. No commitment.