Via @ginabot. Gina bot is a relatively a new service on steemit with tons of options where by it will notify you if you have been given an upvote, comment, mention, resteem etc.. you can customise these options that suit your needs.. here is a detailed guide on how to sign up and use ginabot by @ilyastarar
https://steemit.com/ginabot/@ilyastarar/how-to-use-ginabot-and-get-steemit-seamless-notifications-for-free

Good luck..