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<p class="MsoPlainText">Really appreciate it Mark. I misunderstood few things since the MailScanner interface shows the result of SPF and DKIM check. I thought they are done by MailScanner. Okay, so as long as the original sender can receive some kinds of notification
message, I might try to apply a milter. I am really sorry for bothering all of you but more questions.<o:p></o:p></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoPlainText" style="mso-list:l0 level1 lfo1">I can see there are lots of milter add-ons for Postfix. Are they all doing different jobs? Like you said before, I don't want to deploy redundant milters.<o:p></o:p></li><li class="MsoPlainText" style="mso-list:l0 level1 lfo1">Do you have any suggestions?<o:p></o:p></li></ol>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Thanks very much.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Eoin<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span lang="EN-US" style="mso-fareast-language:EN-AU">-----Original Message-----<br>
From: MailScanner <mailscanner-bounces+eoin.kim=rcst.com.au@lists.mailscanner.info> On Behalf Of Mark Sapiro<br>
Sent: Wednesday, 27 June 2018 12:44 AM<br>
To: mailscanner@lists.mailscanner.info<br>
Subject: Re: [Question] Email flow when using with milter</span></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">On 6/26/18 12:24 AM, Eoin Kim wrote:<o:p></o:p></p>
<p class="MsoPlainText">> Thanks Mark,<o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> So, if I interpret your comment in my own way, if the milter rejects the message, no one (both sender and receiver) will know about what happened to the message. Am I following you? If so, that wouldn't be a pleasant situation for
me.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The sending MTA will receive an SMTP 5xx status with a reason provided<o:p></o:p></p>
<p class="MsoPlainText">by the milter. What happens then depends on how the mail was sent, but<o:p></o:p></p>
<p class="MsoPlainText">the original sender should be notified somehow. The difference is any<o:p></o:p></p>
<p class="MsoPlainText">delivery status notification which may be backscatter to a spoofed<o:p></o:p></p>
<p class="MsoPlainText">sender will come from the sending MTA or upstream and not from your<o:p></o:p></p>
<p class="MsoPlainText">server. This is a good thing.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">> Are there any features similar to milters I can use in MailScanner? I believe, SPF, DKIM, RBL check is possible with it, correct? Thanks again.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The one big downside of MailScanner is your server has already accepted<o:p></o:p></p>
<p class="MsoPlainText">the mail before MailScanner sees it. Thus, any backscatter generated by<o:p></o:p></p>
<p class="MsoPlainText">a MailScanner notice comes from you. MailScanner can check RBLs.<o:p></o:p></p>
<p class="MsoPlainText">Generally SPF and DKIM validation are done by the incoming MTA which<o:p></o:p></p>
<p class="MsoPlainText">generates results headers that are checked by SpamAssassin running by<o:p></o:p></p>
<p class="MsoPlainText">MailScanner.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">MailScanner does support custom functions as a hook to your own code,<o:p></o:p></p>
<p class="MsoPlainText">but this is somewhat limited and doesn't support a 'milter' interface.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-- <o:p></o:p></p>
<p class="MsoPlainText">Mark Sapiro <<a href="mailto:mark@msapiro.net"><span style="color:windowtext;text-decoration:none">mark@msapiro.net</span></a>> The highway is for gamblers,<o:p></o:p></p>
<p class="MsoPlainText">San Francisco Bay Area, California better use your sense - B. Dylan<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-- <o:p></o:p></p>
<p class="MsoPlainText">MailScanner mailing list<o:p></o:p></p>
<p class="MsoPlainText"><a href="mailto:mailscanner@lists.mailscanner.info"><span style="color:windowtext;text-decoration:none">mailscanner@lists.mailscanner.info</span></a><o:p></o:p></p>
<p class="MsoPlainText"><a href="http://lists.mailscanner.info/mailman/listinfo/mailscanner"><span style="color:windowtext;text-decoration:none">http://lists.mailscanner.info/mailman/listinfo/mailscanner</span></a><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
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