<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On 7 November 2016 at 16:26, Karl Auer <span dir="ltr"><<a href="mailto:kauer@biplane.com.au" target="_blank">kauer@biplane.com.au</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Mon, 2016-11-07 at 15:48 +1100, James Gray wrote:<br>
> Unable to relay mail via Telstra's SMTP servers. Postfix is claiming<br>
> "Host or domain name not found. Name service error for<br>
> name=<a href="http://smtp.telstra.com" rel="noreferrer" target="_blank">smtp.telstra.com</a> type=MX: Host not found, try again" but doing a<br>
> manual session to "<a href="http://smtp.telstra.com" rel="noreferrer" target="_blank">smtp.telstra.com</a>" from a TID service works fine<br>
> (both unencrypted TCP/25 and encrypted TCP/465).<br>
<br>
</span>Why would you be looking up an MX record for <a href="http://smtp.telstra.com" rel="noreferrer" target="_blank">smtp.telstra.com</a>? Nobody<br>
has addresses @<a href="http://smtp.telstra.com" rel="noreferrer" target="_blank">smtp.telstra.com</a>, do they?<br></blockquote><div><br></div><div>Nope - and totally agree. Why the hell Postfix is generating that error as of today has got me beat and until I checked on AusNOG spent a bit of time trying to "fix" it too. Seems whatever the cause is not on their Postfix server setup (which has been working for the last 2 years with that mail relay). Like I said, manual SMTP session with the relay works, but none of the mail servers I administer do. Very frustrating.</div><div><br></div><div>Cheers,</div><div><br></div><div>James</div></div></div></div>