Thanks for sending the report. You seem to be running into a macOS bug that only affects SpamSieve on Apple Silicon. If you purchased SpamSieve long ago via the eSellerate store, SpamSieve needs to use Rosetta to validate the license. (Since eSellerate is no longer in business, they have no Apple Silicon version.) If Rosetta is not installed, instead of offering to install it, macOS will cause the app to hang.
You can work around this by using Finder’s Get Info command on the SpamSieve application file and setting it to Open using Rosetta. This should get macOS to offer to install Rosetta for you. Or, you can install Rosetta manually by entering this Terminal command:
Once Rosetta is installed, you can uncheck Open using Rosetta, and SpamSieve will run natively on Apple Silicon.