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# MDaemon Email Server 25.5

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Domain NAT Exemptions | Scroll Prev Top Next More

This screen is available when you have activated the Enabled Advanced User Interface features option on Dynamic Screening's Options/Customize screen.

Use this feature to accommodate a group of MDaemon users who reside on the same external local area network (LAN), which uses network address translation (NAT) to provide a single shared public IP address for all of them. By adding their LAN's public IP address and the MDaemon domain to which the accounts belong, you can prevent the IP address from being blocked by Dynamic Screening when one or more of the users fail authentication due to an incorrect password. Without this feature, a valid user with a misconfigured mail client could cause the LAN's IP address to be blocked and thus prevent all of the users from being able to access their mail. This could happen, for example, when a user's password changes but the user forgets to update a mail client with the new password.

| IP addresses listed here could still be blocked for other reasons, such as bots attempting to log in to non-valid accounts, misconfigured clients attempting to log in to a different MDaemon domain than the one associated with the IP address, and so on. If you wish to completely exclude an IP address from Dynamic Screening then use the Dynamic Allow List.

Adding a Domain NAT Exemption

Click Add, enter the Router Public IP Address of the external LAN, and select the MDaemon Domain whose users will be logging in from that IP address. Then, click OK.

See:

Options/Customize

MDaemon v25.5.0 - October 2025. Copyright © 1996-2025. All rights reserved. MDaemon Technologies