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The server response was: 5.5.1 Authentication Required.



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.

PublishedSMTP Server Requires a Secure Connection

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3 responses

  1. Pingback: Send Multiple Email With Attachment Using ASP.Net With C# | Rajeesh Menoth

  2. Pingback: Send Email To Multiple Email Addresses With Inline Image Using ASP.NET With C# | Rajeesh Menoth

  3. Pingback: Send Email Using ASP.Net With C# | Rajeesh Menoth

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