SMTP and IMAP authentication error

SMTP and IMAP authentication error

Hello,

Since today I can neither send nor receive mails with an external e-mail client. Zoho mail in the browser works fine.
Here is a log of my e-mail client (Thunderbird):

  1. services.settings: Last_modified.json konnte nicht geladen werden: TypeError: NetworkError beim Versuch, die Ressource zu holen.
    Fehler: Serverfehler 503 Service nicht verfügbar
        fetchLatestChanges resource://services-settings/Utils.sys.mjs:390
    window.controllers/Controllers sollte nicht mehr verwendet werden. Verwenden Sie es nicht für die Browser-Erkennung.
    mailnews.smtp: Befehl fehlgeschlagen: 535 Authentifizierung fehlgeschlagen; currentAction=_actionAUTHComplete 
    mailnews.smtp: Authentifizierung fehlgeschlagen: Authentifizierung fehlgeschlagen 
    mailnews.smtp: Befehl fehlgeschlagen: 535 Authentifizierung fehlgeschlagen; currentAction=_actionAUTHComplete 
    mailnews.smtp: Authentifizierung fehlgeschlagen: Authentifizierung fehlgeschlagen

Apparently the password is not accepted.
I urgently need to send e-mails via SMTP using an external programme. Unfortunately, this is not possible directly via Zoho Mail.

Best regards, Thomas

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