Connect guide

Connect Seznam.cz to Muse

Updated 29 October 2026

Yes — Muse can read, search and reply to your Seznam.cz through Mailopoly. Connect Seznam.cz to Mailopoly over IMAP with your normal password, add Mailopoly to Muse as a custom connector, sign in and ask. One connection covers Seznam and every other account you own. Seznam.cz mailboxes use your normal password, unless you've turned on two-factor verification, which requires an app password.

Start a free trial

7-day free trial, no credit card.

This guide also covers email.cz and post.cz — the steps are the same.

Before you start

A Mailopoly account — 7-day free trial, no credit card.
Seznam.cz mailboxes use your normal password, unless you've turned on two-factor verification, which requires an app password.
Access to Muse — Meta is rolling it out country by country.

Connect Seznam.cz to Muse in three steps

1 Connect Seznam.cz 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 Seznam address.
Enter your password. Mailopoly fills in the server settings for you.

Provider help: Seznam help: IMAP settings (Czech) ↗

2 Add Mailopoly to Muse

This part is the same whatever you connected in step 1.

Add Mailopoly to Muse

These steps are taken from public documentation, and we haven't yet checked each one in Muse ourselves. If a label doesn't match what you see, Muse's own help page, linked below, has the current wording.

Open a chat in Muse — on the web or in the app — and ask it to create a custom connector for a remote MCP server called Mailopoly at `https://fastapi.prod.aws.mailopoly.com/mcp-server/`. Muse walks you through the rest.
Sign in with your Mailopoly account when prompted, then choose what Muse is allowed to do. Reading, making changes and sending are separate permissions.
Back in a chat, ask.

Mailopoly isn't in Muse's connector list, so Muse takes it as a custom connector — the same connection, added with one sentence instead of a tap. Muse connects from Meta's cloud, so there's nothing to install.

Connectors in Muse — Meta Help Center ↗

3 Ask about your Seznam

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

Co je dnes důležitého v mé Seznam schránce? (Mailopoly answers in your language.)
Find the invoice in my Seznam mail and tell me the due date.
Reply to the last message from my Seznam address.

Seznam.cz 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.seznam.cz
Port	993
Security	SSL/TLS
Username	Your full email address
Password	Your Seznam password, or an app password if two-factor is on

What Muse can do with Seznam.cz through Mailopoly

Search Seznam.cz — 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 Seznam 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 Seznam 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 Seznam 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 Muse at any time from Settings → Security in the Mailopoly app. More on the security page.

What goes wrong with Seznam.cz, and the fix

Use your full email address as the username, not just the part before the @.
If two-factor authentication is on, your normal password will be refused and you'll need an app password from your provider's security settings.
The help page is in Czech.
Muse doesn't offer to create the connector: say exactly what you want — a custom connector for a remote MCP server called Mailopoly at the address above — and that it signs in with OAuth.
Mailopoly isn't in Muse's connector list: add it as a custom connector instead. It's the same connection to your Mailopoly account.