Send email to gmail account in spam

Hi All,

 

I have a problem, I'm using Sophos UTM is mail security for my mail systems. However, after configured , all account on domain send email to gmail account it's marked in spam. Please help me advice to fix this issue. where was i wrong ? I've already configured DKIM and SPF. Thanks in advance for your attention to this matter.

 

My domain : cha.com.vn

I ran check tool on mxtoolbox.com and results as below: