How do I connect my own custom domain to a solo business email account?

To connect your custom domain, log in to your 138 Enterprise Email portal and retrieve the required DNS records (MX, TXT, CNAME). Add these records to your domain registrar's settings to verify ownership and enable mail routing. Crucially, you must configure sender authentication mechanisms such as SPF, DKIM, and DMARC to ensure your emails are trusted globally and to activate spoofed email identification features. This process binds your domain to the secure, officially direct-operated infrastructure, supporting multi-device access and global delivery. Note that DNS propagation may take time, and while the platform holds certifications like EAL3+, correct local DNS configuration is required for full functionality. If you need help with specific record values, refer to the official service portal or contact direct support.