[1] PostfixによるSMTPサーバの構築(CentOS標準版編) (2007-06-04 20:19:06 +09:00 版) http://www.aconus.com/~oyaji/centos/smtp-centos.htm

[2] 「Postfix」の設定 (2008-06-15 21:12:03 +09:00 版) http://www.crimson-snow.net/hmsvr/centos/maild/postfix.html

[3] Postgrey(Postfix Greylisting Policy Server)日本語ポータル (2009-01-15 16:27:12 +09:00 版) http://www.kozupon.com/postgrey/index.html

[4] Postgrey - Postfix Greylisting Policy Server (2009-07-03 23:54:55 +09:00 版) http://postgrey.schweikert.ch/