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.
--
Viktor. 🇺🇦 Слава Україні!
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