Using the Microsoft IIS SMTP Service for LISTSERV Deliveries
Source: L-Soft International
LISTSERV requires an SMTP server to deliver the mail messages that it generates. While many sites simply configure LISTSERV to forward its mail to their main corporate mail server, some sites prefer to separate their list mail delivery from their "Regular" mail. This is done by setting up one or more dedicated SMTP servers solely for LISTSERV's use. The Microsoft IIS SMTP Service (SMTPSVC) is a free SMTP server available on the Windows platforms. With careful configuration, the recent releases of IIS SMTP can work with LISTSERV to handle small to medium loads on a single server - as well as some larger loads (depending on load patterns and delivery needs). With additional servers, this configuration can be used for loads of any size.