<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On 24 Jun 2010, at 12:57, Jason Ede wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Calibri; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div lang="EN-GB" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0.0001pt; margin-left: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; ">This is purely MTA based, but since a lot of users here run postfix...<o:p></o:p></div><div style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0.0001pt; margin-left: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0.0001pt; margin-left: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; ">How have others found<span class="Apple-converted-space"> </span><a name="reject_unknown_reverse_client_hostname"><b>reject_unknown_reverse_client_hostname</b></a><b><span class="Apple-converted-space"> </span></b>and the more harsh<span class="Apple-converted-space"> </span><a name="reject_unknown_client_hostname"><b>reject_unknown_client_hostname</b></a><b><span class="Apple-converted-space"> </span></b> in postfix? I’m debating implementing them here and wonder if others have found them problematic or useful? I thinking they should be good for weeding out spam emails and I can’t see that they should catch legitimate senders, but want to be sure</div></div></div></span></blockquote><br></div><div>I have to be honest, I ran this for a short while in warn mode and found that the number of people with mis-configured PTR records is huge (In the UK). For example, BT won't let anyone change their PTR, so EHLO/ HELO is always going to be a mismatch for these. Most people running Exchange 'naked' to the Internet end up having a EHLO as <name>.local or some such other non existent TLD so that ends up not matching either and so it goes on.</div><div><br></div><div>As ever YMMV but for me, I found other ways to combat spam coming from these sorts of connections such as RBLs etc.</div><div><br></div><div>Drew</div></body></html>
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