Hi, I use an iMac 27 (end 2012) and have upgraded to Mac OS Sierra 10.12.1 yesterday, coming from El Capitan. Also I have upgraded to the latest version of “Mail”. Since then my SpamSieve has no effect at all. I can see the SpamSieve options in the pull down menu of Mail, but it has absolutely no effect. I de-installed and re-installed, I tried to get a Beta-version of SpamSieve, but whatever I do, SpamSieve is absolutely dead. What can I do?