Each ISP has different requirements for inbox delivery. Here's what PostMTA handles automatically.
Gmail Requirements
SPF, DKIM, DMARC required. Spam rate below 0.1%. One-click unsubscribe required for bulk. Postmaster Tools integration.
Outlook/Office 365
SNDS registration recommended. Smart Network Data Services feedback. Junk mail filtering consideration.
Yahoo
DMARC alignment required for bulk. Feedback loop enrollment. List-unsubscribe header required.
PostMTA's ISP Intelligence
Per-ISP rate limiting, authentication checking before send, complaint tracking and alerting, reputation trend analysis.
Stay compliant: https://postmta.com
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