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# MDaemon Email Server 25.5

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Sender Block List | Scroll Prev Top Next More

The Sender Block List is located at: Security » Security Settings » Screening. This list contains addresses that are not allowed to send mail traffic through your server. If a message arrives from an address on this list, it will be refused during the SMTP session. This is useful for controlling problem users. Addresses may be blocked on a per domain basis or globally (applied to all MDaemon domains).

Messages are refused if they are from addresses listed here

This window displays all currently blocked addresses, listed by the domain that is blocking them.

Domain

Choose the domain with which this blocked address will be associated. In other words, what domain do you wish to prevent from receiving mail from the specified address? Choose "All Domains" from this list to block the address globally.

Email address

Enter the address that you wish to block. Wildcards are accepted, therefore "*@example.net" will suppress any message from any user at "example.net", and "user1@*" will suppress any message from any address beginning with "user1@", regardless of the domain the message is from.

Add

Click this button to add the designated address to the block list.

Remove

Click this button to remove an entry that you have selected in the list.

Check message headers for addresses on block list

By default, MDaemon applies the block list to values taken from the message's From/Sender header(s) during the SMTP session. This prevents the message from getting caught later and moved into the bad queue by the MTA thread.

Delete messages sent from senders on block list (otherwise put in bad queue)

Enable this option if you want MDaemon to delete incoming messages from senders who are on the block list. In addition to regular mail, this option also applies to messages arriving via MultiPOP and DomainPOP. When this option is disabled, the message will be placed into the Bad Message Queue instead of being deleted. This option is disabled by default.

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