My hosting failed to send email from gmail

I had contacted Digital Ocean about my gmail server. They said I must add the record on the domain side.

I had add SPF google and the domain IP is my server IP.

But I failed to send the gmail from my hosting server.

"v=spf1 ip4:128.199.69.30 include:_spf.google.com -all"

I’m using nodeJS to test email function:

var transporter = nodemailer.createTransport({
				host: 'smtp.gmail.com',
			  port: 587,
			  secure: false, // secure:true for port 465, secure:false for port 587
			  auth: {
					user: mConfig.sender_email, // Your email id
					pass: mConfig.sender_password // Your password
			  }
	    });