Adding Support to the New Extension in the Web Server For IIS For IIS, you need to add new mapping for the *.stmail extension. To add new mapping: Select Internet Information Service --> WebEditor --> Properties --> Configuration --> Add. The Add Application Extension Mapping screen appears: In the Extension field, type .stmail. Click OK.
For IIS, you need to add new mapping for the *.stmail extension.
To add new mapping:
The Add Application Extension Mapping screen appears: