title: warning: pipe flag `D' requires dovecot_destination_recipient_limit = 1
body: <p>I have a problem in my postfix. I'm setting my server mail by postfix + dovecot + spamassassin and clamav.
  When I send a multiple email I have the below warning in the log. </p>
  
  <pre><code>Dec 14 12:37:52 mydomain postfix/pipe[30312]: 72210100722: to=&lt;john.doe@mydomain.com&gt;, relay=dovecot, delay=0.35, delays=0.23/0/0/0.11, dsn=4.3.5, status=deferred (mail system configuration error)
  Dec 14 12:37:52 mydomain postfix/pipe[30312]: warning: pipe flag `D' requires dovecot_destination_recipient_limit = 1
  </code></pre>