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<p class="MsoNormal"><span style="color:#1F497D">In postfix there is a verify option.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">From main.cf<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"># HELO restrictions:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">smtpd_delay_reject = yes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">smtpd_helo_required = yes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">smtpd_helo_restrictions =<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> permit_mynetworks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> reject_non_fqdn_helo_hostname,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> reject_invalid_helo_hostname,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> check_helo_access pcre:/usr/local/etc/postfix/helo_access.pcre,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> permit<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"># Sender restrictions:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">smtpd_sender_restrictions =<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> permit_mynetworks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> reject_non_fqdn_sender,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> reject_unknown_sender_domain,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> permit<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"># Recipient restrictions:<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;color:#1F497D">smtpd_recipient_restrictions =<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="color:#1F497D"> permit_mynetworks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> reject_unauth_pipelining,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> reject_non_fqdn_recipient,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> reject_unauth_destination,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> reject_unknown_recipient_domain,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><span style="font-size:12.0pt;color:#1F497D"> <b>reject_unverified_recipient,<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> reject_rbl_client bl.spamcop.net<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"># address verify<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;color:#1F497D">address_verify_map = btree:/var/db/postfix/verify_cache<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;color:#1F497D">unverified_recipient_reject_code = 550<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">From master.cf<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;color:#1F497D">verify unix - - n - 1 verify<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I am very short on time, so maybe i miss something.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">But google will help you out.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><br>
But in general before a message is accepted postfix first ask the destination MTA if the address could be delivered.<br>
If not the sender wil get bounce.<br>
<br>
No need to script the whole shabang together. !<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">gr<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Johan Hendriks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Neuteboom Automatisering<br>
<br>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Van:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> mailscanner-bounces@lists.mailscanner.info [mailto:mailscanner-bounces@lists.mailscanner.info]
<b>Namens </b>Jonas Lilja<br>
<b>Verzonden:</b> woensdag 21 november 2012 22:59<br>
<b>Aan:</b> mailscanner@lists.mailscanner.info<br>
<b>Onderwerp:</b> MTA/Perl script for relaying only to Exchange-users<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Hi, for a couple of years ago there was a guide on mailscanner.info about restricting the MTA (Sendmail) to only deliver email to valid users in an Exchange environment. This made the performance of the server much better
because either MailScanner or Spamassassin need to process invalid emails.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I remember that there was a perl-script which picked up the content from a textfile (with all smtp-addresses in the domain) and then build a special file in /etc/mail/<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I can’t find this guide on the site. Anyone who can help me?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">BR /Jonas Lilja<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="SV"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="SV"><o:p> </o:p></span></p>
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