<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 12 (filtered medium)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p
{mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.Section1
{page:Section1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</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>On Behalf Of </b>Michael Mansour<br>
<b>Sent:</b> Wednesday, November 28, 2007 6:32 AM<br>
<b>To:</b> MailScanner discussion<br>
<b>Subject:</b> Re: Greylisting Addon<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi Peter,<br>
<br>
<b><i>shuttlebox <shuttlebox@gmail.com></i></b> wrote:<o:p></o:p></p>
<p class=MsoNormal>On Nov 28, 2007 1:13 PM, Michael Mansour wrote:<br>
> Yes it is a memory hog, but 400Mb of virtual memory isn't that much<br>
> considering I have over 72,000 auto-managed records per server.<br>
<br>
It's also easy to tune the memory consumption by adjusting how long it<br>
will keep grey/whitelisted entries in the database.<br>
<br>
> I have tried others and found they may work well for one server, but not
in<br>
> a distributed environment which requires sync between MX servers.<br>
<br>
The sync is very important and I haven't found an alternative that is<br>
capable of that.<o:p></o:p></p>
<p class=MsoNormal>Yes, sync is critical. I have also used and tested the
greylist server that comes with DCC by Vernon. I use DCC anyway so though I
might as well turn on the greylist feature and not have to worry about yet
another third party app.<br>
<br>
DCC's greylist also has a "peer" feature which does what
milter-greylist's sync does (not exactly the same way or as instantaneous as
milter-greylist, but still works), so provides the necessary sync between MX
peers.<br>
<br>
DCC's greylist work fine for *non-MX* servers, however for inbound MX servers
which don't have local recipients (but pass the message onto an internal mail
server after releasing the message from the embargo), DCC greylist tries to
authenticate the recipients with the MX server itself, which of course fails
with a "user unknown" and bounces the message to the sender.<br>
<br>
DCC greylist doesn't bother reading sendmail's mailertable to determine where
the destination recipient is or to even consider that it's just an inbound MX
server and should just greylist (embargo in DCC terminology) the email and then
send it on to the real mail server with the inboxes.<br>
<br>
I explained and reported this problem to Vernon but he didn't accept it as a
problem, instead tried to convince me that I didn't need MX servers and I
should just run a beefy mail server. <br>
<br>
A few emails bounced between us before I gave up trying to explain to him why
his greylist implementation doesn't work for inbound MX servers.<br>
<br>
He's a cluely guy and knows his stuff, but I just couldn't get through to him,
he simply didn't accept the setup I had as a valid setup. Go figure.<br>
<br>
Michael.<o:p></o:p></p>
<p class=MsoNormal>-- <br>
/peter<br>
-- <br>
MailScanner mailing list<br>
mailscanner@lists.mailscanner.info<br>
http://lists.mailscanner.info/mailman/listinfo/mailscanner<br>
<br>
Before posting, read http://wiki.mailscanner.info/posting<br>
<br>
Support MailScanner development - buy the book off the website! <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p><span style='color:#1F497D'>Michael,<br>
I also have DCC installed but my system does not host mailboxes, it merely
passes mail on to my exchange servers. Is there no safe configuration then with
DCC alone so I don’t have to install anything else?<br>
<br>
Thanks!<br>
jlc<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
</div>
</body>
</html>