163.com - Email Domain Verification & Deliverability Report

163.com is NetEase's flagship free email platform and one of the most widely used email services in China. Headquartered in Hangzhou, NetEase Inc. launched 163.com as China's first free email provider and it remains a dominant force in the Chinese email market, offering large mailbox storage, spam filtering, and full mobile support.

163.com supports SPF, DKIM, and DMARC authentication for outbound messages, helping recipients verify that emails genuinely originate from 163.com accounts. Given its massive user base, 163.com addresses are frequently encountered in both legitimate business communication and, unfortunately, spam campaigns targeting international recipients.

The 163.com mail servers use strict recipient verification and will immediately reject messages sent to invalid addresses. The platform does not function as a catch-all system. NetEase enforces significant rate limiting on inbound SMTP connections, particularly from IP addresses without established sending reputation.

For reliable delivery to 163.com inboxes, senders should authenticate all outgoing mail with SPF and DKIM, maintain a positive sender reputation, and ensure their IP addresses are not listed on major blocklists. Avoid sending large batches of email to 163.com addresses in short bursts, as this may trigger temporary deferrals or blocks.

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