I need help ASAP with blocked Email....

I need help ASAP with blocked Email....

Hey, every time i send email to my company email adress. The repsond is:

mx.zoho.eu rejected the message you sent to the following email address:
Cannot find the address you sent the message to on the target domain. The address may be misspelled, or it may not exist. To resolve the issue, you can do one or more of the following:
1. You can try and send the message again, but you must delete and re-enter the address before sending it. If your email program automatically suggests an address for you to use, do not select it.
2. You can clear the recipient autocomplete cache in your email program by following the steps in this article: Status Code 5.1.1. Then resend the message, but delete and retype the address before sending the message.
3. You can contact the recipient in another way (for example by telephone) to confirm that you are using the correct address. Ask the recipient if he or she has configured an email forwarding rule that might be forwarding your message to an incorrect address.

mx.zoho.eu got this error:
<office@estatefix.es> User unknown


I need help urgently due to my business usually recieve 14 emails a day. Now i cannot recieve anyone.

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