Those mx[1..4].hotmail.com IPs have been deprecated for a couple of years now I think. I forwarded this on to the team that owns the DNS records for msidentity.com to be addressed.
-----Original Message----- From: mailop <[email protected]> On Behalf Of Benoit Panizzon Sent: Tuesday, April 23, 2019 12:40 AM To: [email protected] Subject: [mailop] All mx?.hotmail.com down? Hi List A customer told us he is getting timeouts trying to send emails to a recipient under @accountprotection.microsoft.com. It looks like he is trying to reply some sort of challenge response system which I guess is not meant to be used by email. mail.msa.msidentity.com mail is handled by 5 mx1.hotmail.com. mail.msa.msidentity.com mail is handled by 5 mx2.hotmail.com. mail.msa.msidentity.com mail is handled by 5 mx3.hotmail.com. mail.msa.msidentity.com mail is handled by 5 mx4.hotmail.com. mail.msa.msidentity.com mail is handled by 10 accountprotection-microsoft-com.mail.protection.outlook.com. Each of the MX?.hotmail.com hostname resolves to several IP Addresses, none of which is reachable. Our postfix never reaches the prio 10 MX, which would accept the email, because it times out while cycling through all the Prio 5 MX IP Addresses. Anyone else seen this problem? Know outage @ Microsoft? Or have they phased out the hotmail.com MX and forgotten this subdomain, as I see that @hotmail.com itself has different MXes. Wouldn't that also cause problem to certain spam filters which check if the sending domain MX is valid and reachable? Mit freundlichen Grüssen -Benoît Panizzon- -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________ _______________________________________________ mailop mailing list [email protected] https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop _______________________________________________ mailop mailing list [email protected] https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
