Domain already associated with another account

Domain already associated with another account

I am unable to link the domain name I own to Zoho Mail - when I try I get the following message:  * This domain is already associated with this account "m*****d@i*****".   However, I don't recall any email address with the format that is mentioned. I can confirm that the I own the domain www.innovaspace.org so what should I do now?