> list-manage.com > This domain does not have any A records. That's not what I see from here. https://xnnd.com/dns.cgi?t=a&d=list-manage.com list-manage.com has address 205.201.132.96 And when you go to https://list-manage.com, you get a notice that this is a Mailchimp domain.
> It has a single MX record pointed at: > mail.admin.mailchimp.com > That hostname exists, but it doesn't have an A RECORD. > It in turn has just a single MX Record. It is true that this weird MX config means nobody can mail [email protected], but also, I see no evidence in the wild that any mail is sent as the top level domain of list-manage.com. I don't even see subdomains of it showing up in my last 90ish days of spamtraps. It appears that Mailchimp uses subdomains under list-manage.com for click tracking (and possibly image hosting). I see ample evidence of this in my email streams. Their return-path domains tend to look more like this -- here's an example one: mail235.atl271.mcdlv.net spamtrap@server:~/log$ host -ta mail235.atl271.mcdlv.net mail235.atl271.mcdlv.net has address 198.2.142.235 spamtrap@ server:~/log$ host -tmx mail235.atl271.mcdlv.net mail235.atl271.mcdlv.net mail is handled by 10 inbound-mx1.mailchimpapp.net. spamtrap@ server:~/log$ host inbound-mx1.mailchimpapp.net. inbound-mx1.mailchimpapp.net has address 148.105.251.24 Those do seem to have properly configured DNS so that async bounces coming back to addresses at that domain would indeed reach inbound-mx1.mailchimpapp.net. So...what? why? What's the concern here again? This really isn't making sense to me. Cheers, Al Iverson -- Al Iverson / Deliverability blogging at www.spamresource.com Subscribe to the weekly newsletter at wombatmail.com/sr.cgi DNS Tools at xnnd.com / (312) 725-0130 / Chicago (Central Time) _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
