...
- 3.220.115.188 - Zapier
- 3.220.22.251 - Zapier
- 52.1.205.184 - Zapier
- 52.6.229.193 - Zapier
- 52.6.82.82 - Zapier
- 54.85.112.125 - Zapier
...
Further reading on List Bombing:
- Word to the Wise: Subscription Boming, ESPs, and Spamhaus:
https://wordtothewise.com/2016/08/subscription-bombing-esps-spamhaus/ - Subscription Bombing: COI, CAPTCHA, and the Next Generation of Mail Bombs:
https://www.spamhaus.org/news/article/734/ - Mailing Lists -vs- Spam Lists:
https://www.spamhaus.org/whitepapers/mailinglists/ - Confirmed Opt In - A Rose by Any Name:
https://www.spamhaus.org/news/article/635 - Spamhaus Marketing FAQ:
https://www.spamhaus.org/faq/section/Marketing%20FAQs