The server response was: 5.5.1 Authentication Required.

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Error :

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.

It’s a common issue we have faced in sending email.how to solve this check the following steps.

Solution:

• Enter the correct login password.
• To remove 2-Step Verification.
• You have to enable login from other timezone / ip for your google account.To do this follow the link  and allow access by clicking the continue button.

• Go to security settings at the following link and enable less secure apps . So that you will be able to login from all apps.

Published : SMTP Server Requires a Secure Connection