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-rw-r--r--software/email.page5
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diff --git a/software/email.page b/software/email.page
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--- a/software/email.page
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@@ -54,3 +54,8 @@ Dovcot and postfix, installed mostly following "linode library" instructions.
mailman for mailing lists.
+setup SPF records.
+
+References:
+
+* [write up of contemporary (2012) techniques](http://blog.phusion.nl/2012/09/10/mail-in-2012-from-an-admins-perspective/)