smtp4dev won't run if ASPNETCORE_ENVIRONMENT environment variable is 'Development'

[christofjans]

I installed smtp4dev using the dotnet tool command:

dotnet tool install -g Rnwood.Smtp4dev --version "3.0.0-*"

Then, when I try to run it using smtp4dev I get reams of errors but the most important one seems to be related to aspnet-webpack

Application startup exception: System.AggregateException: One or more errors occurred. (Webpack dev middleware failed because of an error while loading 'aspnet-webpack'. Error was: Error: Cannot find module 'aspnet-webpack'

[rnwood]

Please can you confirm what it prints during startup:
Hosting environment: Production

[christofjans]

After executing the command smtp4dev the first few lines are:

smtp4dev version 3.0.0.0
https://github.com/rnwood/smtp4dev

Application startup exception: System.AggregateException: One or more errors occurred. (Webpack dev middleware failed because of an error while loading 'aspnet-webpack'. Error was: Error: Cannot find module 'aspnet-webpack'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15)

I did not see the output Hosting environment: anywhere.

The value of the env var ASPNETCORE_ENVIRONMENT is indeed set to Development on my machine.