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<p>Addressing the issue at hand, can you set your MTA not to offer STARTTLS command in the EHLO towards the TPG IP addresses, to force them to use the unencrypted channel?</p>
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<p>Surely others who have played with their TLS1.2 settings on their MTA's are having this issue as well with TPG; how would they have gotten around it?</p>
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<p>M.</p>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> AusNOG <ausnog-bounces@lists.ausnog.net> on behalf of Bradley Silverman <bsilverman@staff.ventraip.com><br>
<b>Sent:</b> Monday, 23 July 2018 15:40<br>
<b>To:</b> Mark Newton<br>
<b>Cc:</b> ausnog@lists.ausnog.net<br>
<b>Subject:</b> Re: [AusNOG] Issues receiving from TPG Mail servers.</font>
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<div dir="ltr">@Michael - I agree that turning it off is the best way of solving it, the issue is we don't have the servers forcing TLS, that's TPG.<br>
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@Mark - These are shared hosting servers, think cPanel & Plesk. The one server is both mail, and website. Which means that the server has websites that accept credit card payments, and therefore is subject to PCI. Any system that is on that server is required
to comply with PCI.
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<div>If the server was website only, then I'd agree 100% that it would be out of scope for PCI, but since the same server runs both email and websites for shared hosting customers, it is in scope.</div>
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<div>We have zero issue with any other MTA, it is only these TPG MTA's that are forcing both TLSv1.0 and an old cipher. If they either turned off TLS or upgraded to TLSv1.2 they would be up to spec.</div>
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<div>But we either have to make the decision to block TPG from being able to send to the 100,000s of email accounts we have, or make it so that none of our customers servers are PCI compliant. I'd rather speak to TPG and work with them to fix the underlying
problem.</div>
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<div dir="ltr">Regards,
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<div>Bradley Silverman | VentraIP Australia<br>
<b>Technical Operations</b><br>
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mobile. +61 418 641 103<br>
phone. +61 3 9013 8464<br>
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<div class="gmail_quote">On Mon, Jul 23, 2018 at 3:34 PM, Mark Newton <span dir="ltr">
<<a href="mailto:newton@atdot.dotat.org" target="_blank">newton@atdot.dotat.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
<div style="word-wrap:break-word; line-break:after-white-space">But PCI Compliance only applies to the Cardholder Data Environment.
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<div>Why on earth would you have a mail server in the Cardholder Data Environment?</div>
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<div>And if it isn’t in the CDE: You can run whatever version of TLS you want, and it’s none of PCI’s business.</div>
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<div> - mark</div>
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<div>On Jul 23, 2018, at 3:06 PM, Bradley Silverman <<a href="mailto:bsilverman@staff.ventraip.com" target="_blank">bsilverman@staff.ventraip.com</a><wbr>> wrote:</div>
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<div dir="ltr">Hi Matt,
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<div>Really appreciate you sending me that email, I will definitely send an email through to there!<br>
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@Mark Certainly not! PCI Compliance requires that TLSv1.0 be disabled on the server. Postifx/Exim/Dovecot are not exception to the rule, if we disable TLSv1.0 on the server and remove the weak cipher, then TPG's MTAs aren't able to send mail to us.</div>
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<div dir="ltr">Regards,
<div><br>
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<div>Bradley Silverman | VentraIP Australia<br>
<b>Technical Operations</b><br>
<br>
mobile. +61 418 641 103<br>
phone. +61 3 9013 8464<br>
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<div class="gmail_quote">On Mon, Jul 23, 2018 at 2:48 PM, Mark Newton <span dir="ltr">
<<a href="mailto:newton@atdot.dotat.org" target="_blank">newton@atdot.dotat.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
<div style="word-wrap:break-word; line-break:after-white-space">You’re trying to exchange payment card information over email?<span class="m_-5051693789520965999HOEnZb"><font color="#888888">
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<div><span class="m_-5051693789520965999HOEnZb"><font color="#888888"> - mark<br>
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<div>On Jul 23, 2018, at 1:30 PM, Bradley Silverman <<a href="mailto:bsilverman@staff.ventraip.com" target="_blank">bsilverman@staff.ventraip.com</a><wbr>> wrote:</div>
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<div>Does anyone have a contact at TPG regarding their mail servers?</div>
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<div>We are having issues with their mail servers using non-PCI compliant ciphers which is stopping our servers accepting mail from them.</div>
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<div dir="ltr">Regards,
<div><br>
</div>
<div>Bradley Silverman | VentraIP Australia<br>
<b>Technical Operations</b><br>
<br>
mobile. +61 418 641 103<br>
phone. +61 3 9013 8464<br>
</div>
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