@
lichao @
kennedy32叫SPF,防止垃圾邮件以及伪造。除此之外还需要DNS Domain Key,邮件Feedback loop,IP的反向解析等。
$ dig txt
google.com; <<>> DiG 9.8.3-P1 <<>> txt
google.com;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38106
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;
google.com. IN TXT
;; ANSWER SECTION:
google.com. 3600 IN TXT "v=spf1 include:
_spf.google.com ip4:216.73.93.70/31 ip4:216.73.93.72/31 ~all"
;; Query time: 103 msec
;; SERVER: 10.136.2.221#53(10.136.2.221)
;; WHEN: Wed May 8 11:33:25 2013
;; MSG SIZE rcvd: 116