Mailinblack similar solution
Similar email validation solution like Mailinblack.
Directly integrated into Mdaemon and easily unlockable by users
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Hello,
Thank you for submitting your idea to add a challenge response system to MDaemon. Unfortunately, we have no plans to implement this system.
Thanks,
Arron
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Totoche
commented
When an outside and unknown person sends an email to Mailinblack, it blocks the email and sends them an email to an url and a captcha, if the person responds correctly it releases the email and memorizes the sender's address for a next time .
Users can still access the list of suspended mails and to release them if necessary.
https://www.mailinblack.com/en/