Since the last few days I have been receiving more newsletter subscriptions than usual. The emails and frequency look suspicious. Like every hour or two. I tested one of the emails with cleantalk and I got:

gracia_mattinson@xxx.xxx reported as spam 42 websites attacked, discovered Oct 14, 2019, last activity Oct 14, 2019 23:26:38.

I don't understand the goal of those subscriptions? Why would they be useful to a spammer? Is there a risk keeping them in my database except having bounces?

How to prevent these spam? I have a CSRF protection on the form, it doesn't seem enough. Thanks.

  • Welcome to Webmasters! Your site may be used for creating a subscription bomb. spamhero.com/support/125230/… I would consider fortifying your form to prevent this. I will keep poking around for more information. – closetnoc Oct 16 '19 at 16:46
  • And here... blog.goptg.com/… I will look into protecting forms when I get back from the hospital. The advice is to use CAPTCHA with 2 forms of verification. This is an important question! Cheers!! – closetnoc Oct 16 '19 at 16:52
  • So I think I understood, it's because I automatically send the last newsletter to the registered user. I have deactivated this for now. – COil Oct 16 '19 at 18:32

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