Sign and verify Internet mail with DKIM/DomainKey signatures

This module implements the various components of the DKIM and DomainKeys
message-signing and verifying standards for Internet mail. It currently
tries to implement RFC4871 (for DKIM) and RFC4870 (DomainKeys).

It is required if you wish to enable DKIM checking in SpamAssassin via the
Mail::SpamAssassin::Plugin::DKIM plugin.