Unfortunately now you have replied the sender does know your address as it will be in the email header information, never ever reply to any spam just bin it and move along.
I have 8 current email addresses and get loads of spam even with the spam filters in my email accounts and Thunderbird the email client I use on my PC and I still get plenty of spam mainly from spoofed email addresses the worst thing that you can do is reply as they just target you more.
I even got loads of spam calls on my android phone but have now installed an app called "Should I answer" which uses a data base of numbers used for spam calls and bars them, not foolproof but better than nothing and it learns as you add any numbers that still get through