On Fri, Nov 21, 2025 at 09:23:48AM +0100, Paul Menzel via mailop wrote:
> While looking more into into unsolicited emails from
> outbound.protection.outlook.com (Microsoft 365(?)), we noticed often away
> messages are sent with an empty SMTP FROM. Are such messages really delivery
> status notifications (DSN)?
https://datatracker.ietf.org/doc/html/rfc3834#section-3.3
--
Viktor. 🇺🇦 Слава Україні!
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