Is the above message from Stellar?
This is a SCAM. They are using a phishing domain where the 's' from stellar.org is replaced by 'ś' if you pay close attention.
Also the e-mail has a random FROM address. Unfortunately I also received it, three times. Somehow an e-mail database must have leaked.
Be careful, do not fall for it! No legitimate campaign will ask you for private keys or any upfront deposit.
Agreed with you this is phishing email which always required to give access to sensitive information like private key. We must be careful and act responsible when we get such email for airdrop there are so many ways to make verify whether it is legit or not.