Good day , 

Hope here i cand find a solution for my problem ,

I have my DNS  hosted on Cloudflare .

I've configured mx record, dkim, cname , dmark and i have 553 error invalid domain.

Moreover , there is some problem with MX record, i've done them several time by deleting and adding back ending in having same respons

I have to mention that I add TXT with my unic code: zoho-verification=zb14405892.validate.zoho.com.

Can someone give me some indications?

Thank you .]

Best regards.