oops, forgot to document the SMTP changes

Author: Richard Jones

doc/customizing.txt

@@ -2,7 +2,7 @@
 Customising Roundup
 ===================
 
-:Version: $Revision: 1.83 $
+:Version: $Revision: 1.84 $
 
 .. This document borrows from the ZopeBook section on ZPT. The original is at:
    http://www.zope.org/Documentation/Books/ZopeBook/current/ZPT.stx
@@ -88,6 +88,23 @@ The configuration variables available are:
 **MAILHOST** - ``'localhost'``
  The SMTP mail host that roundup will use to send e-mail.
 
+**MAILUSER - ``()``
+ If your SMTP mail host requires a username and password for access, then
+ specify them here. eg. ``MAILUSER = ('username', 'password')``
+
+**MAILHOST_TLS - ``'no'``
+ If your SMTP mail host provides or requires TLS (Transport Layer
+ Security) then set ``MAILHOST_TLS = 'yes'``
+
+**MAILHOST_TLS_KEYFILE - ``''``
+ If you're using TLS, you may also set MAILHOST_TLS_KEYFILE to the name of
+ a PEM formatted file that contains your private key.
+
+**MAILHOST_TLS_CERTFILE - ``''``
+ If you're using TLS and have specified a MAILHOST_TLS_KEYFILE, you may
+ also set MAILHOST_TLS_CERTFILE to the name of a PEM formatted certificate
+ chain file.
+
 **MAIL_DOMAIN** - ``'tracker.domain.example'``
  The domain name used for email addresses.