Unable to send website address in an email

Today I tried to forward my website address in an email to a colleague. The email was returned unsent with an error message saying spam present. I narrowed down the offending text to be mywebsite address ‘ormerod.000webhostapp.com

Has anyone experienced this problem. How can I resolve it?

Neville Ormerod

You can try parking a custom domain, abusive users have spoiled the free subdomain for others