email authentication Archives

25 Jul 2026

Why Gmail Could Start Rejecting Your Emails — and the Monthly Checklist That Prevents It

Gmail's evolving sender guidelines require marketers to treat email deliverability as an ongoing operational discipline rather than a one-time DNS setup. A structured monthly review covering five key areas—Postmaster Tools compliance status, spam complaint rate, authentication alignment, one-click unsubscribe headers, and list sunsetting—helps senders stay in good standing and avoid delivery disruptions. Senders who maintain clean compliance records build durable sender reputations and retain more...

06 Jul 2026

Microsoft SMTP AUTH confusion is a warning to inventory every system that sends email

by Dave Murphy

in Featured Posts

Comments

Microsoft is deprecating Basic Authentication for SMTP AUTH in Exchange Online, with Basic Auth being disabled by default for existing tenants at the end of December 2026 and permanent removal announced in the second half of 2027. This affects numerous email-sending systems beyond marketing campaigns, including transactional emails, form notifications, and legacy applications that could break silently, impacting deliverability and sender reputation....

08 Jun 2026

Email Senders Face Microsoft SNDS Migration Deadline with Authentication and API Changes

by Dave Murphy

in Compliance, Featured Posts

Comments

Microsoft is retiring the original Smart Network Data Services (SNDS) portal on June 8, 2026, with significant changes affecting authentication workflows, automated complaint feeds, and report parsing for email senders to Outlook.com addresses. The migration involves moving reports to a REST API, implementing 30-day link expiry, changing JMRP complaint formats to header-only ARF, and requiring 10-month network access renewal cycles....

29 Apr 2026

ARC Email Protocol Experiment Ends as Industry Shifts to DKIM2 Standard

by Dave Murphy

in Authentication, Deliverability, Featured Posts

Comments

The IETF has proposed reclassifying ARC (Authenticated Received Chain) email protocol as 'Historic,' effectively ending the experiment due to reliability issues. This means email marketers can no longer depend on ARC to protect mail authentication when messages pass through intermediaries, while the industry transitions to the more robust DKIM2 protocol....