issue receiving mail from gmail accounts

issue receiving mail from gmail accounts

I've been using zoho as my mail client for almost a year now with little problem

but suddenly this morning i've been experiencing an issue with mail sent from gmail based addresses

i've tried to adjust my dns settings per all your documentation but i continue to receive the following response:

Technical details of permanent failure:
DNS Error: 79382085 DNS type 'mx' lookup of ahn.space responded with code NXDOMAIN
Domain name not found: ahn.space

Any ideas on what I'm doing wrong?

Thanks