What information is required before starting custom domain email setup with 138 Enterprise Email?

To begin custom domain email setup with 138 Enterprise Email, you must have ownership of a registered domain name, administrative access to its DNS settings, and a clear list of user accounts to be created. This service is designed for enterprises, cross-border teams, and small business operators in China and abroad who require secure, branded email communication—such as law firms, electronics exporters, or e-commerce platforms like GUORLAN or Điện tử Lạc Hào. You must also confirm whether your domain is currently using another email provider, as migration requires coordination of MX, SPF, DKIM, and DMARC records to ensure uninterrupted delivery and prevent spoofing. 138 Enterprise Email supports direct DNS configuration via its official portal and requires no third-party agents. The setup is only valid for domains under your legal control; domains registered under shared hosting or third-party platforms without DNS access cannot be used. Before proceeding, verify that your domain’s registrar allows DNS record modifications and that your organization has internal approval for email security compliance, especially if operating in regulated industries such as legal or financial services. Once prepared, log in to the 138 Enterprise Email official service portal to initiate domain binding, where step-by-step DNS guidance is provided. If DNS changes are unfamiliar, schedule a free migration consultation through the portal to avoid delivery failures or security gaps. Note that activation is only available through official channels—no resellers or third-party tools are supported.