On Tue, 29 Apr 2014 17:11:32 +0000, Matthew Black <[log in to unmask]>
wrote:

> I am looking for a how-to guide that goes beyond just entering information into LISTSERV. Something that explains how I can test my SPF and DomainKey records,

There are various SPF record checkers.  I use MXToolbox SuperTool.

DomainKeys DNS Testing Tools 
  DomainKey Policy Record Tester. 
   http://domainkeys.sourceforge.net/policycheck.html

  DomainKey Selector Record Tester. 
   http://domainkeys.sourceforge.net/selectorcheck.html

>instructions for verifying that a message has been properly signed.

get a yahoo or gmail account.  Subscribe that account to a test list 
(configured to sign of course) send a message to that list. Upon receipt,
examine the full headers (message source) to verify if yahoo or gmail
validate the signing.

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