Etherscan.io is a good website that you can use. 
Simply login and enter your address in this format:
And click on 'Watch' as shown here and you can be given notification on the address via emails, and not just limited to your own one. Cheers!
https://image.prntscr.com/image/qxRKu0sDQH6MhywWSEsLhg.png
will it alert every airdrops? Simply login and enter your address in this format:Code:
https://etherscan.io/address/YOUR_ADDRESS_HERE
And click on 'Watch' as shown here and you can be given notification on the address via emails, and not just limited to your own one. Cheers!
https://image.prntscr.com/image/qxRKu0sDQH6MhywWSEsLhg.png
Seems like not I did it like you wrote but did not get any email, do I do something wrong? (It seems that you get only when you receive ETH not ERC tokens).