"This is mostly a minor bugfix release. One of the fixes, however, repairs
a variable scope problem that could cause false negatives during SSP
checks. Thus, an upgrade is advised if you're running 2.5.0 or 2.5.1."
sender authentication system proposed by the E-mail Signing Technology
Group (ESTG). DKIM is an amalgamation of the DomainKeys (DK) proposal
by Yahoo!, Inc. and the Internet Identified Mail (IIM) proposal by
Cisco.
