SERVER fulfills the same purpose here as the server parameter in the XCALL parameter list is used only if SERVER is blank or not specified. Since a given installation will probably always use the same server, it may be much more convenient to put the information here in the configuration file than having to embed it in the application. Note that although the traditional default port for SMTP servers remains 25, most modern SMTP servers use other ports such as 465 (typically for implicit SSL connections) or 587 (typically for STARTTLS). To avoid confusion, append the port number to the server DNS name or IP address. For example:

SERVER = localhost:10025    ; local SMTP server on port 10025

SERVER = 1.2.3.4:9925       ; SMTP server at 1.2.3.4 port 9925

SERVER = mail.myisp.net     ; SMTP server at ISP