You can temporarily disable SpamSieve by unchecking the SpamSieve rule(s) that you created in your mail program.
To uninstall SpamSieve, delete any rules that you created for it in your e-mail program. You can also delete the AppleScripts and/or plug-in that you installed, and the SpamSieve application and its data files, which are stored in:
/Users/<username>/Library/Application Support/SpamSieve
The preferences file is stored in:
/Users/<username>/Library/Preferences/com.c-command.SpamSieve.plist
The plug-in is located at:
/Users/<username>/Library/Mail/Bundles/SpamSieve.mailbundle
You can also re-enable Apple Mail’s built-in junk mail filter from the Junk Mail tab of its Preferences window.
The plug-in is located at:
/Users/<username>/Library/Application Support/Eudora/PlugIns/SpamSieve Eudora Plug-In
After uninstalling the SpamSieve plug-in, you can re-enable Eudora’s own junk mail support by selecting the Eudora icon in the Finder and choosing Get Info from the File menu. In the Plug-Ins tab of the info window, you can check or uncheck the various plug-ins to enable or disable them. Check all the plug-ins containing the words “Junk” or “Spam.”