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Gmail The SMTP server 5.5.1 Authentication Required

Gmail錯誤:SMTP伺服器需要安全連線或客戶端未通過身份驗證。伺服器響應是:5.5.1需要驗證

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

https://www.google.com/settings/security/lesssecureapps
https://myaccount.google.com/security#connectedapps
如果出現 5.5.1 Authentication Required 請開啟此連結進行 啟用
https://myaccount.google.com/security#connectedapps