Connect guide

Connect STRATO to Claude and ChatGPT

Updated 20 September 2026

Yes — Claude and ChatGPT can both read, search and reply to your STRATO through Mailopoly, which is listed in the Claude Connectors Directory and is an approved app in the ChatGPT app directory. Connect STRATO to Mailopoly over IMAP with your normal mailbox password, add Mailopoly in Claude or ChatGPT, and ask. The whole setup takes about a minute. STRATO mailboxes use the password set for that mailbox in your STRATO customer area — there's no app password to generate.

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7-day free trial, no credit card.

Before you start

A Mailopoly account — 7-day free trial, no credit card.
STRATO mailboxes use the password set for that mailbox in your STRATO customer area — there's no app password to generate.
Claude on any plan, including Free, or ChatGPT with apps enabled.

Connect STRATO to Claude or ChatGPT in three steps

1Connect STRATO to Mailopoly

Start a Mailopoly account at mailopoly.com/sign-up — 7-day free trial, no credit card.
In Mailopoly choose Add email account and enter your full STRATO address.
Enter the mailbox password. Mailopoly fills in the server settings for you.

Provider help: STRATO help: IMAP server settings (German) ↗

2Add Mailopoly to Claude or ChatGPT

This part is the same whatever you connected in step 1. Mailopoly is listed in both directories, so it's a search and a tap — no endpoint URL to paste.

Claude

Open Settings → Connectors on claude.ai or in the Claude app — or choose Add connectors from the + menu in any chat.
Search the directory for Mailopoly and choose Connect.
Sign in with your Mailopoly account when prompted, then choose what Claude is allowed to do. Reading, making changes and sending are separate permissions.
Back in the chat, make sure the Mailopoly connector is switched on, then ask.

One listing covers Claude.ai, Claude Desktop, Claude mobile, Claude Code and Cowork, and it works on every Claude plan, including Free. In Claude Code you can also run claude mcp add --transport http mailopoly https://fastapi.prod.aws.mailopoly.com/mcp-server/ and then /mcp to sign in.

Mailopoly in the Claude Connectors Directory ↗

ChatGPT

Open the Apps directory in ChatGPT — from the + menu in any chat, or Settings → Apps & Connectors.
Search for Mailopoly and choose Connect.
Sign in with your Mailopoly account when prompted, then choose what ChatGPT is allowed to do. Reading, making changes and sending are separate permissions.
In any chat, type @Mailopoly and ask.

Mailopoly is an approved app in the ChatGPT app directory, so there's no developer mode and no endpoint URL to paste. Once connected it's available in every ChatGPT conversation on the web and in the mobile apps.

Mailopoly in the ChatGPT app directory ↗

Using something else? Claude Code, Cowork, Codex and any client that supports remote MCP servers connect the same way — the Mailopoly MCP page has the endpoint and per-client steps.

3Ask about your STRATO

Whatever you've connected to Mailopoly is what your assistant can reach. Some things people ask on day one:

Was ist heute Wichtiges in meinem STRATO Posteingang? (Mailopoly answers in your language.)
Find the invoice in my STRATO mail and tell me what's due.
Reply to the last client email from my STRATO address.

STRATO server settings

Mailopoly fills these in for you when you enter your address. They're here in case you need to check them or your provider uses something unusual.

IMAP server	imap.strato.de
Port	993
Security	SSL/TLS
Username	Your full email address
Password	Your STRATO mailbox password

What Claude and ChatGPT can do with STRATO through Mailopoly

Search STRATO — and every other account you own — in one question. By sender, date, topic, or the half-remembered phrase somewhere in the body.
Read your Cleanbox, not your whole inbox. Mailopoly sorts STRATO as it arrives: personal and important mail in Cleanbox, promotions and newsletters in Other. Ask for either.
Summarise a thread, a day or a week. "What did the school send this week?" comes back as an answer, not a list of links.
Reply from your STRATO address, in your voice. Save a draft to Mailopoly for review, or send — sending is a separate permission and a confirm-first action.
Schedule a send for later, and cancel it if you change your mind.
Pull out invoices, events and deliveries. Amounts and due dates, calendar invitations, parcel tracking — extracted on arrival and added to My Day.
Find an attachment. Every attachment from STRATO lands in PolyBox, so "find the PDF the accountant sent" just works.
Unsubscribe, snooze, file and mark read from the chat, on whichever account the mail belongs to.

Reading, making changes and sending are separate permissions you grant when you connect, and you can revoke an assistant at any time from Settings → Security in the Mailopoly app. More on the security page.

What goes wrong with STRATO, and the fix

Use your full email address as the username, not just the part before the @.
The mailbox password is set in the STRATO customer area, separately from your customer login.
The help page is in German.

Start a free trial

7-day free trial, no credit card. Connect STRATO in about a minute.

Frequently asked questions

Does Claude or ChatGPT see my STRATO password?

Can I connect more than one account?

Does it work in Claude Desktop, Claude mobile and Claude Code?

Is there a free trial?

How does Mailopoly keep the connection safe?

Claude and ChatGPT connect to Mailopoly through OAuth 2.1 — a revocable, scoped sign-in, never a password. Reading, making changes and sending are separate permissions, every tool call is audit-logged against your account, and you can revoke any assistant from Settings → Security → Connected AI assistants in the app. Mailopoly is independently security-assessed to CASA Tier 2 by TAC Security.