* Web.de: please check if [IMAP is enabled](https://hilfe.web.de/pop-imap/imap/imap-serverdaten.html))
* Web.de: please check if [IMAP is enabled](https://hilfe.web.de/pop-imap/imap/imap-serverdaten.html)
* GMX: please check if [IMAP is enabled](https://support.gmx.com/pop-imap/toggle.html) ([German](https://hilfe.gmx.net/pop-imap/einschalten.html))
* GMX: with two factor authentication you'll need to use [an app password](https://support.gmx.com/security/2fa/application-specific-passwords.html) ([German](https://hilfe.gmx.net/sicherheit/2fa/anwendungsspezifisches-passwort.html))
* T-online.de: please make sure you use [an email password](https://www.telekom.de/hilfe/festnetz-internet-tv/e-mail/e-mail-adresse-passwoerter-und-sicherheit/passwort-fuer-e-mail-programme-einrichten) (German) and not your account password