There is no reason why you can't just log into your account and change the email.
Hi! Listen, is it good if the account is registered on a domain @mail.com ? It's just that I used to have a mailbox there and then it was deleted because I rarely went there. Here I am wondering if it will happen that if my account freebitco.in that is registered using a mailbox @mail.com it will be blocked because the mailbox on the domain @mail.com can be deleted after some time? Maybe it's better not to register at all @mail.com?