<font color="#330033"><font size="2"><font face="verdana,sans-serif">Bill,<br><br>I can tell by the IP address of your "ktel" server where you are hosted. I can tell you anecdotally that we had a horrible experience there. Admittedly some of it was Layer 8 issues, but in short, we are "former and unhappy" customers of that facility.<br>
<br>A couple other ideas came to mind here as this thread was piling up responses:<br><br>* Your user logs that have all relevant troubleshooting information shaved off of them -- is there any indicator of at least the friendly error message? e.g. was it adress not found, was it host/domain not found, etc?<br>
<br>* On your server, can you tell if perhaps the comeback was hitting your secondary MX server, and was getting greylisted again there? Perhaps they are coming in and hitting your primary first, but returning to your secondary?<br>
<br>* Least likely scenario: the route to your IP is getting intermittent interruption, and you're only noticing the errors when try #2 from a greylist doesn't make it.... is it possible that try #1 isn't getting there at all in some cases?<br>
<br>Best,<br><br>Angelo<br><br></font></font></font><br><div class="gmail_quote">On Wed, Jan 12, 2011 at 10:38 AM, William Yang <span dir="ltr"><<a href="mailto:wyang@gcfn.net">wyang@gcfn.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div class="im">On Wed, 2011-01-12 at 10:14 -0500, Rob Funk wrote:<br>
> They may be using a blocklist that prevents them from receiving mail from IP<br>
> addresses whose Terms Of Service prohibit running mail servers. Many home<br>
> ISPs add their address blocks to such blocklists themselves, and many mail<br>
> servers (including mine) use such lists. Mail coming from residential<br>
> addresses is almost always spam or malware from zombie machines.<br>
<br>
</div>Yeah, I thought of that, too... but my mail server is on a raised floor<br>
in a corporate hosting facility....<br>
<div class="im"><br>
-Bill<br>
--<br>
William Yang<br>
<a href="mailto:wyang@gcfn.net">wyang@gcfn.net</a><br>
<br>
<br>
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