How do I configure my 138 enterprise email for optimal inbox placement in Gmail, Outlook, and QQ Mail?

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.