email verification password

hello

anyone know how can I install those "verification with password" replies to avoid SPAM on a cPanel server?

a user should be able to configure if he wants this feature enabled for each of his mailbox
if he enables it, all mails sent to him from a non-verified E-Mail address will receive a reply requesting some word (on those blurry images) to be typed so the E-Mail address will be considered verified.

i guess this would need some integration with cPanel...

thanks in advance for any suggestion email verification password

 

 

 

 

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