I have got the problem with creating first mail address in my own domain - pl***cz.pl. After providing addresses I still receive "Can not add alias" error message. I think that it may be caused by my recent actions when I tried similiar steps with other domain - pl***cz.cf. Then everything went alright, mail account was created and I could sent and receive mails. After that I bought the new domain, then removed the previous one but unfortunately my account is still binded with mail address from old domain (pl***cz.cf) and I am receiving errors mentioned before.

What should I do now to create address in my new domain?