Added comments regarding new sender_name (%s) and sender_address (%a)

arguments/properties for external mail processors.

ctrl/mailproc.cfg

@@ -30,6 +30,8 @@
 ;
 ;     %h = sending SMTP server's host name
 ;     %i = sending SMTP server's IP address
+;     %s = sender's name or e-mail address (e.g. "Rob Swindell")
+;     %a = sender's e-mail address (e.g. "rob@somehost.com")
 ;
 ;     %u = authenticated user number (0=unauthenticated)
 ;
@@ -138,6 +140,9 @@
 ; The sending SMTP server's IP addrses (%i) is available to JavaScript modules
 ; using the 'client.ip_address' property.
 ;
+; The sender's name (%s) and e-mail address (%a) are available to JavaScript
+; modules using the 'sender_name' and 'sender_address' properties.
+;
 ; See the example JavaScript mail processor (mailproc_example.js) in your
 ; Synchronet EXEC directory for more details.
 ;