Not recieving mails

Not recieving mails

Hello guys. My zoho mail was working just fine until today. Now, every time people try to send me an email they get this message:

Your message wasn't delivered to  daniel@mondaynightburgers.com.br  because the address couldn't be found. Check for typos or unnecessary spaces and try again.

Even though there are no typos.

Can someone help me? I use this account as my main mail account so I had to contact all my contacts telling them to mail me on a different account, which wasn't much fun :(

Thank you very much,
Daniel