External filters are DLL modules that are loaded in memory and invoked each time a message is received.
The filter should return a result if it wants IceWarp Server to mark the message in some way.

Button |
Description |
Add |
Click the button to create a new external filter. The External Filter dialog opens. See bellow. |
Edit |
Select an existing external filter and click the button to edit this filter. The External Filter dialog opens. See bellow. |
Delete |
Select an existing external filter and click the button to remove this filter. |
Arrows |
Select an existing external filter and use the arrows to move this filter up or down in the list i. e. to change the order in which the filters are applied (top first). |
"B" button |
Click the button to specify senders, recipients, domains and IP address ranges that will not have these filters applied. For more details about bypassing filters, refer to the Bypassing Rules/Filters section. |

Field |
Description |
Title |
Fill in some descriptive text. |
Module |
The DLL library which is called to evaluate messages. |
Message |
If no SMTP message is defined, this one is used plus it has pre-defined prefix. |
SMTP Message |
This message is used in SMTP connections as a response when the message was caught by this filter. |
Enabled |
Activates/deactivates the filter. |