Use the below settings/steps to configure the mail id in Gmail.
1. Log in to Gmail and open Gmail settings
2. Select the "Accounts & Import" option
Please access below link for screenshot
4. Add all required Details like " Name, Email ID"
5. Then click on the next button
6. Use below server settings
SMTP server: smtp.quickpost.app
Username: Full Email-ID
Password: User password
Tick Secure connection using SSL
7. Then enter the verification code you have received at your quick post email id which we want to sync with gmail.