Email going to outlook spam

Email going to outlook spam

Hi,
I recently setup my zoho email with my shopify store and i did a test email to my personal email addresses. I noticed the outlook emails are getting marked as spam, yahoo and gmail delivers fine.

I did a search and realize it's a common problem with Zoho emails and it's really bothering me seeing as a lot of my customers still use the outlook/hotmail accounts. 
I've added all the required TXT  settings but still the same issue. Can someone help me out with this please?