update to Listed Host FAQ

All,
In a few minutes I will make the following update to the Listed Host FAQ
to cover null-sender questions.

Please let me know if you have suggestions.
Thanks,
Eric

--- /var/www/dsbl.org/faq-listed.en.php 2005-02-16 17:25:39.000000000 +0000
+++ ./faq-listed.en.php 2005-03-30 21:34:51.681912776 +0000
@@ -185,6 +185,15 @@
 reason or another. Since this is your server, not ours, you will have to
 fix the configuration.</p>

+<p>A common problem is servers refusing mail from a null sender (MAIL
+FROM: <>).  Many administrators (and vendors) apparently think that this
+helps reduce spam.  It does not.  Not only is it a violation of the SMTP
+specification (RFC 2821), it prevents you from receiving Delivery Status
+Notifications about mail that you send out.  Your users will never know
+if their emails bounced.  It also prevents you from receiving DSBL
+removal confirmations.  Mail servers configured with this "feature"
+cannot be removed from DSBL.</p>
+
 <p>Another common problem is missing reverse-DNS (rDNS).  This is an
 absolute requirement for removal.  Every IP address on the Internet has
 (or ought to have) a hostname associated with it.  If someone on the


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