For security reasons, Tucows will never send the domain login information to anyone. Only the Domain Provider that handled the registration and payment for your domain can email the username/password to the Administrative Contact or Owner Contact email address.
If the Administrative Contact email address is no longer valid, you will need this address updated in order to have the domain’s username/password sent to you.
Domain Providers are responsible for providing technical support to their customers for the domains they sell. You can use this page to look up your Domain Provider.