From: dane [mailto:dane-bounces(_at_)ietf(_dot_)org] On Behalf Of Jiankang Yao
for OPENPGPKEY/SMIMECERT zones, operators could (maybe SHOULD) use
NSEC/NSEC3 "narrow" signing to prevent "zone-walking".
email addresses are not secret. That is not the privacy you can protect
at all. Anyone can either do a internet search or just attempt to
deliver an email to figure out if the email address is valid.
if there is a "email zone walking", the email spammer can use this feature to
get the valid addrees easily and send trash emails.
If we hope to prevent the spammer from getting the email address easily, the
email address should be regarded as secret.
This is, IMO, a nightmare when using IPv6.... spammers sending email with new
IP and sometimes they know how to bypass the content filtering antispamming ...
Hosnieh
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