This error indicates that the authentication details provided are incorrect. Check the following: 1. The username entered is correct. 2. The password is valid. 3. If Multi-Factor Authentication (MFA) or two-step verification is enabled for your SMTP ...
This issue usually occurs due to incorrect server configuration details. Please verify that: 1. The SMTP server name is entered correctly. 2. The port number is valid for the selected connection type. 3. The correct connection type (SSL, TLS, or ...
This error occurs when the email server rejects the request because the "From" address does not belong to or is not authorized for the configured SMTP account. To resolve this, please ensure that: The SMTP username and the "From" email address are ...
The SMTP server is automatically disabled when email delivery fails multiple times. If the server fails to send an email three times and encounters another failure within a 24-hour period, Zoho Forms disables the SMTP configuration to prevent further ...