How to restrict login IPs for 138 Enterprise Email?

To restrict login IPs for 138 Enterprise Email, administrators can configure IP whitelisting through the official management console. This feature allows only specified IP addresses or ranges to access email accounts, enhancing security for enterprises with fixed office networks or VPN setups. Common causes for setup issues include incorrect IP format entry, overlapping ranges, or lack of administrator permissions. Before implementation, verify your domain is fully activated and ensure you have documented all legitimate corporate IPs. Note that this feature may not support dynamic IP environments like mobile networks, and overly restrictive settings could block legitimate remote access. For step-by-step guidance or if configurations fail, contact 138's official support team via the service portal for direct assistance, as they manage activation and migration processes without third-party agents.
For detailed configuration steps, administrators should log into the web management console and navigate to the security settings section to define permitted IP addresses or ranges.