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-rw-r--r--software/email.page2
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diff --git a/software/email.page b/software/email.page
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@@ -59,3 +59,5 @@ setup SPF records.
References:
* [write up of contemporary (2012) techniques](http://blog.phusion.nl/2012/09/10/mail-in-2012-from-an-admins-perspective/)
+
+http://sealedabstract.com/code/nsa-proof-your-e-mail-in-2-hours/