Michael, after installing Mountain Lion my computer seemed to be working okay. But today, Mail slowed to a crawl and eventually the whole computer became unusable. I used Activity Monitor to try to see what was happening and found up to 15 processes called “spamsieve-reader” running simultaneously and pegging my CPU. (see attached screen shot)
It was unbelievable. I couldn’t even force quit the processes, use the Finder to try to disable SpamSieve, or anything else. SpamSieve itself (the app) was non-responsive.
After several restarts with similar results, I finally managed to disable SpamSieve by removing the items in my User Library/Mail/Bundles and /LaunchAgents folders, then Zipping the application itself.
All in all, I lost about 3 hours of work today and needless to say do NOT want this to re-occur.
Do you know what caused this? And how to prevent it?
I’m running OS 10.8.1 on a MacBook Pro 2.4 GHz Dual Core machine.
9 email accounts
I access my email from my iPhone and iPad, where I’ve had no problems.