libdkim1d - 1:1.0.21-4+b1 main

DomainKeys Identified Mail (DKIM) defines a domain-level
authentication framework for email using public-key cryptography and
key server technology to permit verification of the source and
contents of messages by either Mail Transport Agents (MTAs) or Mail
User Agents (MUAs).
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libdkim is a library, developed by Alt-N Technologies, that allows
incorporating DKIM into an existing MTA or other application. It
provides full support for signing, verifying, and SSP. See the
changelogs for information on compliance with specifications.