I can not send nor recieve emails

I can not send nor recieve emails

Today I stopped receiving emails to my adress emma@trojascenkonst.se which is hosted by Zoho. I sent a number of test emails and I got this reply: 

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Delivery to the following recipient failed permanently:

      emma@trojascenkost.se

Technical details of permanent failure:
DNS Error: 97167788 DNS type 'mx' lookup of  trojascenkost.se  responded with code NXDOMAIN
Domain name not found:  trojascenkost.se

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I can also not send emails. Yesterday I could still receive emails so this problem started just now.

What can be wrong and what can I do about it?

Thanks for any help! 

Best regards,
Emma Örn