How to change invitation list pending status?

How to change invitation list pending status?

Our domain kpdc.co.in has 2 users and when I try to add new user named ' cmd@kpdc.co.in' the email is not created but appears in invitation list wherein I am not able to do anything except a re-send button. Since we do not have any emails created with username 'cmd', there is no-one or nowhere to accept such an invitation.

How can I get around this, please?