Add an entry about alternatives to Sendmail, for mail servers.

This is becoming a very common topic in -questions :-/

Reviewed by:	roam, lioux, Tom Rhodes <darklogik@pittgoth.com>,
		silence on -doc

en_US.ISO8859-1/books/faq/book.sgml

@@ -7017,6 +7017,36 @@ define(`confDELIVERY_MODE',`deferred')dnl</programlisting>
         </answer>
       </qandaentry>
 
+      <qandaentry>
+        <question id="sendmail-alternative">
+          <para>What other mail-server software can I use, instead of
+	    Sendmail?</para>
+        </question>
+
+        <answer>
+          <para><ulink url="http://www.sendmail.org/">Sendmail</a> is
+            the default mail-server software for FreeBSD, but you can
+            easily replace it with one of the other MTA (for instance,
+            an MTA installed from the ports).</para>
+
+          <para>There are various alternative MTA's in the ports tree
+	    already, with <port>mail/exim</port>,
+	    <port>mail/postfix</port>, <port>mail/qmail</port>,
+	    <port>mail/zmailer</port>, being some of the most popular
+	    choises.</para>
+
+	  <para>Diversity is nice, and the fact that you have many
+            different mail-servers to chose from is considered a
+            <emphasis>good thing</emphasis>, therefore try to avoid
+            asking questions like <quote>Is Sendmail better than
+            Qmail?</quote> in the mailing lists.  If you do feel like
+            asking, first check the mailing list archives.  The
+            advantages and disadvantages of each and every one of the
+            available MTA's have already been discussed a few
+            times.</para>
+	</answer>
+      </qandaentry>
+
       <qandaentry>
         <question id="forgot-root-pw">
           <para>I have forgotten the root password!  What do I do?</para>