The email contains a redeem code which is used to "attach" your license to your Scirra account.
Loosing the email has no effect. You can only use the redeem code once. Once it has been used, the redeem code becomes irrelevant.
If you bought the license on the website, when connected you should have access to it in the "Your downloads" page.
If you bought it on Steam then you likely just have to install again C2 for Steam.
If you have further issue, send an email to and stop jumping to ridiculous conclusions and posting wrong informations you have actually no clues about.
You have been away for a while, perhaps you should take the time to inform yourself instead of posting as much as you do for nothing and giving away wrong and uninformed advices...
Making a backup of the license is not a bad idea, but assessing that a lost email ends up to money lost is just wrong.