Please remove your e-mail ID from the post first.

Can you not change your e-mail ID from here?
https://www.gog.com/account/settings/security

Well...:

1. It's never a good idea to give up personal info on the internet, as everything outside your own computer is considered public. Once it's out there you can't take it back. Perhaps you might learn when people use your info, or mail address in this case, to sign up for some bondage, lady knickers or libero ads in the mail. *Enlargements* is also an option.

Some people scan pages on the internet automatically after email addresses, either for hacking/cracking purposes or to send spam.

2. When using free/public email services: Always have a backup mail in case of emergency. Never let go of this kind of mail address unless you're absolutely sure you don't need it, or something isn't connected to it.

3. Lastly, pay for an email account. Free email account gives you zero control in case you get hacked or loose it. Microsoft or Google couldn't care less about you - only what you use it for.

Oh, and have a continued merry Christmas/holiday and a happy new year. :P

PS: GOG should have made it possible to access your account, either through Galaxy, or via browser auto-login initiated by Galaxy... I don't personally use Galaxy, but one can only wonder why they don't do it...