Complete configuration flow for 263 Enterprise Mail — a long-established Chinese provider with many overseas nodes, friendly to foreign trade. You must first manually enable the Client Authorization Code feature in the web interface's Account Security section, then create a new code. When binding, fill in the authorization code, not the login password.
Complete configuration flow for 35 Enterprise Mail (35.com) — its IMAP/SMTP server addresses use your own company domain (imap.yourdomain / smtp.yourdomain), unlike other providers with fixed servers. You must use the Client Authorization Code generated in the web UI, not the login password.
Complete configuration flow for NetEase Enterprise Mail — servers come in 'Recommended + Backup' pairs, you must use the 16-digit Client Authorization Password generated in the web UI (not the login password), and bind a phone number before generating it. Binding errors with ERR.LOGIN.IPDENY mean the admin set an IP whitelist — they need to lift the restriction.