Dear All,

Kaspersky (21.3.10.381m) is driving me crazy with Thunderbird (128.11.0esr) and gmx-server. I am not able to connect to the GMX-server. I tried the following options:

1.) POP3 and IMAP in Thunderbird (options set in GMX-Mail Server), both options not working to connect to gmx mail server. Connection possible with deactivation of Kaspersky. Ports and servers for GMX correctly set (also for SMTP)

2.) Certificate (Windows and Mozilla) not working. I added manually the certificate to Mozilla

3.) In Firefox Kasspersky Add-on installed

4.) GMX Account removed and added manually in Thunderbird. For quite some time automated connection via Thunderbird-server was not possibel (GMX not found)

I am really running out of ideas and I am very close to get rid of Kaspersky. Any ideas or hints (I do not want ot work with exceptions for ports or programms regarding virus protection)- With a deactivation of Kaspersky everything runs smooth.

 

Thanks for your support and ideas

kappelzwert

@kappelzwerg Welcome.

41 minutes ago, kappelzwerg said:

Kaspersky (21.3.10.381m) 

Can you please provide which application you are running.

Dear Berny,

sorry for my late reply, I received the notification about your question on 13.06.2026. I am running Kaspersky Internet Security 21.3.10.381m.

Best Regards Kappelzwerg

@kappelzwerg

Please upgrade for free to Kaspersky Standard 

Whith an on top installation + reboot Kaspersky Standard will import your license and your settings.