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Spf Dkim

2 GoKawiil briefs on this topic

Outlook.com begins silently bouncing mail from domains lacking DMARC records

Since November 5, 2026, Microsoft's consumer email service has been rejecting a portion of incoming mail from domains that have not published a DMARC DNS record, even when those domains have working SPF and DKIM. Affected senders receive a 550 5.7.1 bounce citing missing SPF/DKIM/DMARC authentication, and Microsoft has not issued any public notice explaining the change.

mailroute.net · 2026-11-08

Guide details SPF, DKIM and DMARC setup using Mailfully's domain tool

A new how-to guide walks through configuring SPF, DKIM and DMARC records for a sending domain, using Mailfully's setup process as the working example. It explains that SPF authorizes sending IPs, DKIM cryptographically signs messages, and DMARC checks alignment between the two and enforces a policy, with receiving servers using all three to decide whether mail is legitimate.

mailfully.com · 2026-10-01