The Listener comes with a UDP listening library, lsn_udp.dll, which is loaded by default.
When using an SMTP gateway, you must specify an SMTP listening library. You can specify a library with the dblsn -d option, and specify library options with the dblsn -a option.
The following is a list of options supported by the UDP listening library:
| Option | Description |
|---|---|
| Port=port-number | This option specifies the port number to listen to. The default port is 5001. |
| Timeout=seconds | This option specifies the maximum blocking time of a read operation on the UDP listening port. This value must be smaller than the polling interval of the UDP listening thread. The default is 0. |
| ShowSenderPort | This option reveals the sender port number in all occurrences of the $sender action variable. By default, the port number is hidden. When this option is specified, the port number is appended at the end of the sender address with the :port-number syntax. |
| HideWSAErrorBox | Suppresses the error box showing errors on socket operations. |
| CodePage=number | Multibyte characters are translated into Unicode based on this number. This option only applies to Windows Mobile devices. |
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