Today they have MX but last week they had empty answer with NOERROR to MX queries :-)
Cheers tobi On Mon, 2026-06-29 at 17:11 +1000, Viktor Dukhovni via mailop wrote: > On Mon, Jun 29, 2026 at 08:25:43AM +0200, Tobi via mailop wrote: > > > in the last days we're seeing that Microsoft is using > > "forms.mail.microsoft" as envelope SMTP sender-domain. As this > > domain > > does neither have A or MX it's considered unresolvable by our > > postfix > > MTA. Anyone else seeing that domain in their mailflow? > > My DNS queries return: > > ; NOERROR qr rd ra ad > forms.mail.microsoft. IN MX 0 > sponaeop.mail.protection.outlook.com. > > ; NOERROR qr rd ra > sponaeop.mail.protection.outlook.com. IN A 52.101.40.4 > sponaeop.mail.protection.outlook.com. IN A 52.101.11.7 > sponaeop.mail.protection.outlook.com. IN A 52.101.41.54 > sponaeop.mail.protection.outlook.com. IN A 52.101.10.1 > > Perhaps the MX RRset is newer than the messaegs you recorded, or > perhaps > there's a DNS issue on your end. _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
