<div dir="ltr"><div>It's putting the horse before the cart to look into blocklists etc before the e-mail domain is correctly configured...</div><div><br></div><div><br></div><div><a href="http://vger.kernel.org/cgi-bin/mxverify-cgi?DOMAIN=trevor%40tecnopolis.ca&SUBMIT=Submit+to+VGER.KERNEL.ORG">http://vger.kernel.org/cgi-bin/mxverify-cgi?DOMAIN=trevor%40tecnopolis.ca&SUBMIT=Submit+to+VGER.KERNEL.ORG</a></div><div>
<h1>MX-VERIFY-CGI run for ``<a href="mailto:trevor@tecnopolis.ca">trevor@tecnopolis.ca</a>''</h1>
<hr>
<h1>Doing resolver lookup for T=MX domain=``<a href="http://tecnopolis.ca">tecnopolis.ca</a>''</h1>
<h1>Questionable: NO MX DATA: domain=``<a href="http://tecnopolis.ca">tecnopolis.ca</a>'' We SIMULATE!</h1>
<h1>Do have at least one MX entry added!</h1>
</div><div><br></div><div><br></div><div><a href="https://mxtoolbox.com/emailhealth/tecnopolis.ca/">https://mxtoolbox.com/emailhealth/tecnopolis.ca/</a></div><div>
<h2>7 Problems</h2>
<table class="gmail-table" cellspacing="0" cellpadding="0" border="0">
<thead>
<tr>
<th style="width:25px"><br></th>
<th>Category</th>
<th>Host</th>
<th>Result</th>
<th><br></th>
</tr>
</thead>
<tbody>
<tr class="gmail-subaction gmail-smtpTR gmail-failedTR">
<td><br></td>
<td>dmarc
</td>
<td><a href="http://tecnopolis.ca">tecnopolis.ca</a>
</td>
<td>
No DMARC Record found
</td>
<td style="width:100px"><br></td>
</tr>
<tr class="gmail-subaction gmail-smtpTR gmail-failedTR">
<td><br></td>
<td>spf
</td>
<td><a href="http://tecnopolis.ca">tecnopolis.ca</a>
</td>
<td>
No SPF Record found
</td>
<td style="width:100px"><br></td>
</tr>
<tr class="gmail-subaction gmail-smtpTR gmail-failedTR">
<td><br></td>
<td>mx
</td>
<td><a href="http://tecnopolis.ca">tecnopolis.ca</a>
</td>
<td>
No DMARC Record found
</td>
<td style="width:100px"><br></td>
</tr>
<tr class="gmail-subaction gmail-smtpTR gmail-failedTR">
<td><br></td>
<td>mx
</td>
<td><a href="http://tecnopolis.ca">tecnopolis.ca</a>
</td>
<td>
DNS Record not found
</td>
<td style="width:100px"><br></td>
</tr>
<tr class="gmail-subaction gmail-smtpTR gmail-failedTR">
<td><br></td>
<td>mx
</td>
<td><a href="http://tecnopolis.ca">tecnopolis.ca</a>
</td>
<td>
DMARC Quarantine/Reject policy not enabled
</td>
<td style="width:100px"><br></td>
</tr>
<tr class="gmail-subaction gmail-dnsTR gmail-failedTR">
<td><br></td>
<td>dns
</td>
<td><a href="http://tecnopolis.ca">tecnopolis.ca</a>
</td>
<td>
SOA Serial Number Format is Invalid
</td>
<td style="width:100px"><br></td>
</tr>
<tr class="gmail-subaction gmail-dnsTR gmail-failedTR">
<td><br></td>
<td>dns
</td>
<td><a href="http://tecnopolis.ca">tecnopolis.ca</a>
</td>
<td>
SOA Expire Value out of recommended range
</td>
<td style="width:100px"><br></td></tr></tbody></table>
</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Apr 28, 2021 at 7:21 AM Trevor Cordes <<a href="mailto:trevor@tecnopolis.ca">trevor@tecnopolis.ca</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">So there are tons of "email-sending" blacklists out there.<br>
<br>
Are there "email-receiving" blacklists? Is that a thing?<br>
<br>
We're trying to get emails from Hilton Honors to our @<a href="http://tecnopolis.ca" rel="noreferrer" target="_blank">tecnopolis.ca</a> email<br>
address(es) and they just refuse to send to us. Even on the phone with<br>
support to triple confirm the email address it refuses to send to us.<br>
<br>
When I say refuses to send to us, I mean it won't even connect to port 25<br>
on our server. Just nothing, nada. It's not a greylisting or RBL problem<br>
on our side because it's not even opening a socket. I can tell, I have<br>
full access to the verbose mail logs and tcpdump.<br>
<br>
All other vendors seem to have no trouble sending to us. Just Hilton.<br>
The big email providers like gmail send to us perfectly fine. I've never<br>
seen anything like this.<br>
<br>
Now, I do have trouble sometimes with Akamai's *web* hit blacklist, though<br>
I'm mostly "good" with them now. People don't use Akamai *web* RBLs for<br>
outgoing mail servers, do they? Is that a thing? I don't see that as an<br>
Akamai product offering...<br>
_______________________________________________<br>
Roundtable mailing list<br>
<a href="mailto:Roundtable@muug.ca" target="_blank">Roundtable@muug.ca</a><br>
<a href="https://muug.ca/mailman/listinfo/roundtable" rel="noreferrer" target="_blank">https://muug.ca/mailman/listinfo/roundtable</a><br>
</blockquote></div>