Hello Mailman3 users, 

I've seen a massive uptick in bogus subscription requests with real addresses, 
either being used to DDoS outside mailboxes or just for intrusion/scanning. (It 
looks like a lot of fake random strings for name and then valid addresses like 
scanning/scamming tools like Acunetix generate.) 

When these hit thousands of gmail addresses they get classified as spam and 
hurt our overall deliverability. 

Has anyone yet built a CAPTCHA integration for the Subscription/Sign Up path? 

Regards, 
--Jered 
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