I did several times a clean build.
My development machine is a MacBook Pro M1 on Monterey and therefore I cannot use Xcode 12 anymore.
I wan to copy just the application to the older Mac and not use Xcode on that machine.
The test project was also created on my development machine.
Any yes: The error message is really strange.
Great_Om
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Meanwhile I got it working.
Now I use SwiftSMTP which works well in background.
See “swift-smtp/Sources/SwiftSMTPCLI/main.swift“ for sample code how to use it.