I only get the odd one pop up asking me the same.
You wonder how total strangers can get your e-mail address in the first place.
I have no idea as to how you would stop them but will watch your thread closely to see if i can get any tips.
Galaxy Note 8 vs iPhone X
Awful clip art from 1994 is being tweeted every hour by a bot
iPhone X vs Samsung Galaxy Note 8
Les meilleurs navigateurs internet 2017