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diff --git a/docs/glossary.rst b/docs/glossary.rst
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@@ -46,3 +46,17 @@ Glossary
more server applications. Application Administrators do not necessarily
need system level access if the managed application has other means of
administration, for example a web based administration frontend.
+
+ DKIM
+ Domain Key Identified Mail
+ A mechanism where legitimate mail for a domain is verifiable by a
+ signature in a mail header and a corresponding public key in a specific
+ :term:`DNS` record. Outgoing mail servers for the domain have to be
+ configured to add the necessary signature to mails for their domains.
+
+ DNS
+ Domain Name System
+ DNS maps names to other information, the most well known use case is
+ mapping human readable names to IP addresses, but their are more
+ applications for DNS like service discovery, storage of public keys and
+ other public information.