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Start by verifying your domain’s DNS records: publish SPF, DKIM, and DMARC with strict alignment (p=quarantine or p=reject). For Gmail and Outlook, ensure your sending IP has warm-up history and consistent volume; for QQ Mail (widely used in China), add your domain to Tencent’s Whitelist Portal and monitor feedback loops. We recommend running a full deliverability audit first—this identifies misconfigurations, reputation risks, and regional signal gaps before launch. You can request your free diagnostic report to get a prioritized remediation checklist.

A zero-downtime migration requires three synchronized phases: (1) Pre-migration validation—verify MX, TLS, and authentication settings; (2) Staged cutover—route new mail through 138 while retaining legacy routing for fallback; (3) Post-migration monitoring—track inbox placement rates across Gmail (US/EU), Outlook (global enterprise), and QQ Mail (CN) for 72 hours. Our migration plan includes automated DNS health checks and real-time bounce classification—ideal for teams managing multi-region user bases. Get your tailored migration checklist now.

Trust isn’t configured—it’s continuously earned. Confirm baseline trust by checking: (a) SPF/DKIM/DMARC alignment status via our free domain validator; (b) absence from major RBLs (e.g., Spamhaus, SORBS, and Tencent’s internal blacklist); (c) consistent TLS 1.2+ enforcement and valid certificate chain. Crucially, monitor *regional* signals: Gmail evaluates engagement metrics per sender domain; QQ Mail weighs local complaint rates and whitelist status. We surface these signals side-by-side in your deliverability dashboard—so you see not just ‘is it working?’, but ‘is it working *where it matters most*?’ Request your personalized trust readiness report.