If you receive the 535 Authentication Failed Zoho (535) error code when you try to send an email message from your Zoho Mail account using Gmail, it means that the password is incorrect in the email client you have configured your account.
You might have enabled the Two Factor Authentication (TFA) feature on your Zoho Mail account. In such a case, you have to use the application specific password to configure the Zoho Mail account in the email client.
To resolve the 535 Authentication Failed error code (535) error message, generate and update the application specific password as given in the following steps.
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