SMTP, PMTA, dedicated IPs, ESPs, and the sending stack decisions that determine whether your email lands in the inbox or the spam folder.
Cold email infrastructure in 2026: the five layers, the build order, sending limits, the data mistake that burns domains, and when not to DIY.
Office 365 SMTP relay in 2026: the 5 sending methods, which to pick by scenario, the Basic Auth deprecation, and the settings that actually work.
SMTP relay services in 2026: what they do, when you need one, how to choose, and the deliverability rules that matter for high-volume sending.
Cold email, deliverability and outbound — reported from the operator side. One email a week.
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