17 04 2015

https://help.ubuntu.com/community/Postfix/SPF
and
http://www.conhost.net/faq_artikel-18.htm
http://www.labnol.org/internet/authenticate-google-apps-email-with-spf/13877/

Example syntax for the SPF record:

b-nm.at
v=spf1 include:_spf.google.com ip4:78.46.156.164 ip6:2a01:4f8:190:6423::2 ~all

Hinweis -all vs. ~all:
https://support.google.com/a/answer/178723?hl=en

Tool for checking the SFP entries / syntax:
http://kitterman.com/spf/validate.html

Google check tool:
https://toolbox.googleapps.com/apps/checkmx/

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