IIS
The dynamic nature of SMP requests always lead to problems with IIS configuration, because the number of source domains can be very dynamic.
Luckily starting with IIS 10 there is a solution called "Wildcard Host Header Support". See https://docs.microsoft.com/en-us/iis/get-started/whats-new-in-iis-10/wildcard-host-header-support for details. According to this site, versions prior to IIS 10 are not supported.
See the image below for an example configuration:
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