Connect GMX

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You connect GMX over CalDAV with your GMX address and an app-specific password. You create it in two minutes right in your GMX settings — after that everything runs automatically, and sync picks up changes every 5 minutes.

The most common pitfall

For external programs like Kalender Sync, GMX requires an app-specific password — your regular GMX password won’t work here.

1. Create an app-specific password

1. Open account.gmx.net, sign in and go to “Login & Security”.
2. Scroll to “App-specific passwords” and click “Manage app-specific passwords”.
3. Click “Create new app-specific password”, give it a name (e.g. “Kalender Sync”) and confirm with “Next”.
4. Copy the password shown — for security reasons it’s only displayed once.

2. Connect in Kalender Sync

1. In the dashboard: “Connect calendar” → “GMX” → “Continue” to the form.
2. Enter your GMX email address (e.g. name@gmx.de or name@gmx.net).
3. Paste the app-specific password and click “Test & Connect” — Kalender Sync verifies the connection immediately.

If “sign-in failed” appears

• Did you really use the app-specific password, not your regular GMX password?
• Best to paste the password fresh instead of typing it.
• Password deleted in your GMX settings in the meantime? Simply create a new one (step 1).

Ending access

In Kalender Sync: remove the calendars. You can also delete the app-specific password at account.gmx.net any time — access ends immediately.