I took the additional step of checking all the mail.settings... keys and 
they are all set to values that look correct. I also retested the gpg 
--list-secret-keys [email protected] and it produces a set of codes 
consistent with recognizing my address. 

The failure is happening in this block of code in tools.py:
            if sign:
                import string
                core.check_version( None )
                pin = string.replace( payload_in.as_string(), '\n', '\r\n' )
                plain = core.Data( pin )
                sig = core.Data()
                c = core.Context()
                c.set_armor( 1 )
                c.signers_clear()
                # search for signing key for From:
                for sigkey in c.op_keylist_all( self.settings.sender, 1 ):
                    # !!! THIS BLOCK OF CODE IS NEVER GETTING EXECUTED
                    if sigkey.can_sign:
                        c.signers_add( sigkey )
                if not c.signers_enum( 0 ):
                    # THIS IS WHERE THE ERROR MESSAGE IS GETTING GENERATED
                    self.error = 'No key for signing [%s]' % 
self.settings.sender
                    return False

For some reason, c.op_keylist_all(...) is returning nothing so no signers 
are added to the list. I tried running this code standalone from inside a 
python shell and it seemed to work. Could it be an environmental variable 
isn't getting propagated to tools.py?

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