Is GMX.com MailCheck for USA, CA, UK, FR and ES safe?

Clean risk

This extension shows email notifications and quick browser access for supported GMX, mail.com, and Outlook accounts.

It notifies users about email in the browser and on the desktop, and lets them read, write, and delete messages from a preview panel. The description says this international version is for GMX users in countries such as the USA, Canada, the UK, France, and Spain, and does not support GMX accounts from Germany, Austria, or Switzerland.

1&1 Mail & Media GmbHFirefox Add-ons
0Risk
Who publishes it

1&1 Mail & Media GmbH - no other listings under this identity, 32 shared hostnames

What this publisher told the store about itself, and the other listings that told it the same thing.

Publisher
1&1 Mail & Media GmbH

Shared hosts - 32 hostnames

Hostnames hardcoded in this extension that few other listings call. That can mean one operator behind both, and it can equally mean a small shared vendor, so it is context rather than a conclusion. Hosts that many listings call are left out: they are services, not connections.

wa.gmx.com
Also called by 1 other listing: mail.com MailCheck
mail.com
Also called by 2 other listings
navigator-lxa.mail.com
Also called by 2 other listings
gmx.net
Also called by 3 other listings, including Fenerbahçe SK Anasayfa
go.gmx.com
Also called by 3 other listings, including GMX MailCheck for Firefox
search.gmx.com
Also called by 3 other listings, including WEB.DE MailCheck for Firefox
suche.1und1.de
Also called by 3 other listings, including GMX MailCheck for Firefox, mail.com MailCheck
suggestplugin.1und1.de
Also called by 3 other listings
suggestplugin.gmx.com
Also called by 3 other listings, including WEB.DE MailCheck for Firefox
suggestplugin.gmx.net
Also called by 3 other listings, including GMX MailCheck for Firefox, mail.com MailCheck
suggestplugin.mail.com
Also called by 3 other listings, including mail.com MailCheck
suggestplugin.ui-portal.de
Also called by 3 other listings, including WEB.DE MailCheck for Firefox
suggestplugin.web.de
Also called by 3 other listings, including WEB.DE MailCheck for Firefox, GMX MailCheck for Firefox
gmx.com
Also called by 4 other listings
search.mail.com
Also called by 5 other listings, including MailCheck
suche.web.de
Also called by 5 other listings, including MailCheck
suche.gmx.net
Also called by 6 other listings
1und1.de
Also called by 7 other listings
bs.navigator.gmx.net
Also called by 7 other listings
bs.navigator.web.de
Also called by 7 other listings
dl.mail.com
Also called by 7 other listings
dl.web.de
Also called by 7 other listings
lts.1und1.de
Also called by 7 other listings, including MailCheck, MailCheck
netid.de
Also called by 7 other listings, including MailCheck
oauth2.gmx.com
Also called by 7 other listings
oauth2.mail.com
Also called by 7 other listings
uas2.uilogin.de
Also called by 7 other listings, including MailCheck, MailCheck
wikipedia.de
Also called by 7 other listings
dl.gmx.net
Also called by 8 other listings
img.ui-portal.de
Also called by 8 other listings, including MailCheck
dl.1und1.de
Also called by 9 other listings
dl.gmx.com
Also called by 9 other listings

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

Publishers can request a review.

Where it sends data

Destinations our analysis observed GMX.com MailCheck for USA, CA, UK, FR and ES contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.

  • www.google.comwidely used

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to www.google.com. A widely used service: 169 other extensions we have analysed send data here.

  • www.google.co.uk

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to www.google.co.uk. 2 other extensions we have analysed send data here.

  • www.google.at

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to www.google.at. One other extension we have analysed sends data here.

  • www.google.ch

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to www.google.ch. One other extension we have analysed sends data here.

  • dl.1und1.de

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to dl.1und1.de. No other extension we have analysed sends data here.

  • dl.gmx.com

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to dl.gmx.com. No other extension we have analysed sends data here.

  • dl.gmx.net

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to dl.gmx.net. No other extension we have analysed sends data here.

  • dl.mail.com

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to dl.mail.com. No other extension we have analysed sends data here.

  • dl.web.de

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to dl.web.de. No other extension we have analysed sends data here.

  • gmx.co.uk

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to gmx.co.uk. No other extension we have analysed sends data here.

  • gmx.com

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to gmx.com. No other extension we have analysed sends data here.

  • gmx.es

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to gmx.es. No other extension we have analysed sends data here.

  • gmx.fr

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to gmx.fr. No other extension we have analysed sends data here.

  • mail.com

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to mail.com. No other extension we have analysed sends data here.

  • search.gmx.com

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to search.gmx.com. No other extension we have analysed sends data here.

  • Outlook

    GMX.com MailCheck for USA, CA, UK, FR and ES sends data to Outlook. Named as a recipient by 3 other extensions we have analysed.

Updated 15 October 2026amo-2575203