Not able to access the admin mail

Not able to access the admin mail

For the domain neetfortn.in the parent or admin email id is webadmin@neetfortn.in. Using this we created one user id address by name contentteam@neetfortn.in

We are able to access contentteam@neetfortn.in but not the main email id webadmin@neetfortn.in. I understand the controlpanel has to be accessed from this id but am not able to access the same. The error message I receive is Invalid mail address. 

Please check and do the needful.

Thanks
Contentteam@neetfortn.in