Hi helpdesk,

I'm the IT guy of our company.

We've our business mail stored at zoho and we're having issues sending mails to some persons.

Those emails that couldn't be delivered belongs to the same domain "aena.es" which is an important airport of Spain.

We receive and automatic message which says:

***********************************

<name-of-person>@aena.es, ERROR_CODE :550, ERROR_CODE :Denied by policy

****************************

No attachments, mails to only one person (not a distribution list).

We use Outlook 2016.

How can I fix this situation?

Is there any thing that I can do? 

Thank you in advance and regards,

César.-