puffin.netは安全ですか？

Their spam blocklist contains entries so old that they are useless. See hxxp://www.puffin.net/projects/abuse/domains/bad_a.php One well documented case of spammers using innocent domains is included in the spamwiki here: ***** where Spamit/Glavmed mailers used the domain ***** in their spams over an extended period, trading on its reputation. Well documented, but not noticed by puffin, which includes ***** in their blacklist as spammers. Do not rely on such a list to block spam. Most real spammers only use a domain for a few weeks before moving to a new one. (Even when they spam for established companies, they usually include a disposable domain name in the spam itself, then redirect traffic to the real target.) But innocent domains that are included in spammers' emails to improve their deliverability end up falsely maligned for years on blocklists that do not set expiration dates on entries.