Unable to receive mails - DNS Error

Unable to receive mails - DNS Error

I've bought the mail server and until today nobody can send me emails.
The people who have tried, got the error below. In mxtoolbox, I see the problems below (according to mxtoolbox).

Could you guys help me?

6 Problems

Category Host Result
dmarc safewayqatar.com Missing or Invalid Record  More Info
https safewayqatar.com The Certificate has a name mismatch  More Info
dns safewayqatar.com SOA Refresh Value is outside of the recommended range  More Info
dns safewayqatar.com SOA Expire Value out of recommended range  More Info
smtp mx2.zohomail.com Reverse DNS does not match SMTP Banner  More Info
smtp mx2.zoho.com Reverse DNS does not match SMTP Banner  More Info