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BoxTrapper act as a spam filter for email address. Filter works through “challenge-response” verification. When an email sent to account which use BoxTrapper, verification email will be sent as automatic respond. This email verification compels the sender to reply verification request, leaving the subject. When the reply received, the original message will be sent to the intended recipient.
Enabling BoxTrapper is purposed to block BoxTrapper email to which is not replying verification email.
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