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&SU... MX-VERIFY-CGI run for ``trevor@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@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... _______________________________________________ Roundtable mailing list Roundtable@muug.ca https://muug.ca/mailman/listinfo/roundtable