Gmail failed to sent out from QnE Optimum

When try to use Batch Email to send out Statement of Account and system show error message as below “SMTP Authentication Failure”

Step 1 -  Check the Email Setting for Gmail is correct.

If the Email Setting is correct and still failed to send out email  that means Gmail security had blocked to send email by 3^rd party software

Step 2 -  Please done the step below to allow 3^rd party software to send out email

1)      Login Gmail on Web Browser.

2)      Click  icon > Click Settings > Click Accounts > Click Google Account Settings

3)      Click Security > Now can see that Less secure app accessis turn off > Click Turn on access (not recommended)

4)      Turn on Allow less secure apps

After that try send batch email again and it’s successful.