Got three emails from these, Stellar airdrop for BTC and BCH owners, offering free crypto coin but I wasn't able to find anything about them on the web. So bells are ringing.
There were some stellar airdrops that happened officially but there were also some fake airdrops or in other words scam attempts actually reported here:
https://bitcointalk.org/index.php?topic=5096363.0Post some details so that we are able to help you out if this is official one or merely a scam attempt.