There are enough alternatives to using your secret key on MEW. At least use Trust browser or MetaMask with Chrome. And when youre serious about crypto and have more than a thousand /$ in it definitely go for an Ledger Nano S or similar.
Oh and never klick on any MEW links in E-Mails, they are always fake. Period.
Set the correct link as a bookmark in your browser and keep an eye out for tweets from MEW.