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Hi,
5.5.1 Error is related to "SMTP Server Requires a Secure Connection" . So please check the following steps.
- 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.
Reference :
http://www.c-sharpcorner.com/blogs/smtp-server-requires-a-secure-connection1
http://www.c-sharpcorner.com/UploadFile/2a6dc5/how-to-send-a-email-using-Asp-Net-C-Sharp/
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Please refer the below article.
https://www.emailarchitect.net/easendmail/kb/csharp.aspx?cat=2