<div dir="ltr"><div>Robert - thanks for clarifying.</div><div><br></div><div>Sadly the information at <a href="https://dnsbl.zonecheck.org">https://dnsbl.zonecheck.org</a> doesn't provide any details on how to report issues or even troubleshoot the problem.</div><div><br></div><div>Steven<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Oct 15, 2022 at 5:39 PM Robert Mibus <<a href="mailto:mibus@mibus.org">mibus@mibus.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On the topic of mail blocking... it says via <a href="http://bl.zonecheck.org" rel="noreferrer" target="_blank">bl.zonecheck.org</a>, so you can check:<br>
<br>
$ host 2607:f8b0:4864:20::229<br>
9.2.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.ip6.arpa<br>
domain name pointer <a href="http://mail-oi1-x229.google.com" rel="noreferrer" target="_blank">mail-oi1-x229.google.com</a>.<br>
<br>
(DNS the other way matches, FTR, so this PTR record is accurate)<br>
<br>
$ host <a href="http://9.2.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.bl.zonecheck.org" rel="noreferrer" target="_blank">9.2.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.bl.zonecheck.org</a><br>
<a href="http://9.2.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.bl.zonecheck.org" rel="noreferrer" target="_blank">9.2.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.bl.zonecheck.org</a><br>
has address 127.0.0.10<br>
<br>
127.0.0.10 is indeed the "spamtrap" address at<br>
<a href="https://dnsbl.zonecheck.org/#traps" rel="noreferrer" target="_blank">https://dnsbl.zonecheck.org/#traps</a><br>
<br>
> <a href="http://spamtrap.bl.zonecheck.org" rel="noreferrer" target="_blank">spamtrap.bl.zonecheck.org</a> - Our spamtrap honeypot. This will list IP's who send to our<br>
> honeypot trap addresses, these are special addresses that have never been, nor ever will<br>
> be, used anywhere, they are discreet hidden addresses designed to "trap" address<br>
> harvesters.<br>
> Usage of this list is considered to be safe, very low risk<br>
> Listing Duration: long.<br>
> Code: 127.0.0.10<br>
<br>
Poking around other values near the address, I'd say the /64 is on the<br>
blocklist.<br>
<br>
Blocking outbound IPs fromused by Gmail is not likely a good SNR for a<br>
filter; hopefully Noel sees this via the list and can remove the<br>
relevant entry/entries.<br>
-- <br>
Robert Mibus <<a href="mailto:mibus@mibus.org" target="_blank">mibus@mibus.org</a>><br>
</blockquote></div>