[RndTbl] email-receive blacklist?

[Colin Stanners]

It's putting the horse before the cart to look into blocklists etc before
the e-mail domain is correctly configured...


http://vger.kernel.org/cgi-bin/mxverify-cgi?DOMAIN=trevor%40tecnopolis.ca&SUBMIT=Submit+to+VGER.KERNEL.ORG
MX-VERIFY-CGI run for ``trevor at tecnopolis.ca''
------------------------------
Doing resolver lookup for T=MX domain=``tecnopolis.ca'' Questionable: NO MX
DATA: domain=``tecnopolis.ca'' We SIMULATE! Do have at least one MX entry
added!


https://mxtoolbox.com/emailhealth/tecnopolis.ca/
7 Problems

Category Host Result

dmarc tecnopolis.ca No DMARC Record found

spf tecnopolis.ca No SPF Record found

mx tecnopolis.ca No DMARC Record found

mx tecnopolis.ca DNS Record not found

mx tecnopolis.ca DMARC Quarantine/Reject policy not enabled

dns tecnopolis.ca SOA Serial Number Format is Invalid

dns tecnopolis.ca SOA Expire Value out of recommended range

On Wed, Apr 28, 2021 at 7:21 AM Trevor Cordes <trevor at tecnopolis.ca> wrote:

> So there are tons of "email-sending" blacklists out there.
>
> Are there "email-receiving" blacklists?  Is that a thing?
>
> We're trying to get emails from Hilton Honors to our @tecnopolis.ca email
> address(es) and they just refuse to send to us.  Even on the phone with
> support to triple confirm the email address it refuses to send to us.
>
> When I say refuses to send to us, I mean it won't even connect to port 25
> on our server.  Just nothing, nada.  It's not a greylisting or RBL problem
> on our side because it's not even opening a socket.  I can tell, I have
> full access to the verbose mail logs and tcpdump.
>
> All other vendors seem to have no trouble sending to us.  Just Hilton.
> The big email providers like gmail send to us perfectly fine.  I've never
> seen anything like this.
>
> Now, I do have trouble sometimes with Akamai's *web* hit blacklist, though
> I'm mostly "good" with them now.  People don't use Akamai *web* RBLs for
> outgoing mail servers, do they?  Is that a thing?  I don't see that as an
> Akamai product offering...
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