https://blogs.damiendye.uk/en/tags/exchange-online/ Recent content in Exchange-Online on Damien Dye's Blog Hugo en-GB Thu, 22 Oct 2026 18:45:00 +0100 https://blogs.damiendye.uk/en/email/microsoft-365-the-fisher-price-it-edition/ Thu, 22 Oct 2026 18:45:00 +0100 https://blogs.damiendye.uk/en/email/microsoft-365-the-fisher-price-it-edition/ The house rules held against Exchange Online, from Microsoft's own docs and read-only DNS. No tenant-wide require-TLS switch, no rejecting an SPF or DKIM failure, DNSSEC not planned for the mail host every tenant uses, and the NCSC's own MX has no IPv6. What it lets you turn on, what it will not, and where its own docs disagree.