I just upgraded and SpamSieve is still disabling its plugin and launch of Mail.
Not sure why, I was led to believe this bug had been fixed.
It is not just that I have to go and activate the puffin it is the spam that floods in while I am distracted by something I should not have to do, activate a software plugin. 44 Spam messages arrived in that time.
You need to look at this as an urgent issue.