pub fn microsoft_mx_kind(host: &str) -> Option<MicrosoftKind>Expand description
Whether a mail exchanger is Microsoft’s, and of which kind: Outlook.com’s
(*.olc.protection.outlook.com: personal accounts, and the addresses of a
domain of your own Outlook.com receives), Microsoft 365’s
(*.mail.protection.outlook.com, older *.mail.eo.outlook.com and
*.mail.protection.outlook.de, and *.mx.microsoft where the domain
signs its mail exchange with DNSSEC). A whole label before each, so that
names only made to look like these are not taken.