2) If you want to remove those spam e-mails from the newsletter subscription
Then go to your nopCommerce DATABASE.
Go to nop_NewsletterSubscription Table
you will see all the e-mail that subscribed for your newsletter, for those spam e-mails , in the "Active" column make it "False" or you can just delete the rows with those spam e-mail addresses
The problem is automatic response to check a valid subscription. I cannot check original table after response delivered. Newsletter is a good idea, but in my case is too critical. This is a advertising exposition problem.
2) If you want to remove those spam e-mails from the newsletter subscription
Then go to your nopCommerce DATABASE.
Go to nop_NewsletterSubscription Table
you will see all the e-mail that subscribed for your newsletter, for those spam e-mails , in the "Active" column make it "False" or you can just delete the rows with those spam e-mail addresses
When I tried that cooment it blew up my page but this worked fine: