I updated to beta 4 (GM Candidate) & confirmed Yosemite still does not filter spam (aka junk mail) as well as Mavericks... Whenever spam makes its way past server side filtering (if any), then right-clicking spam in Yosemite Mail (to 'mark as junk') loads the entire message including images from the spammer, which is really bad & I believe unlike previous versions of Mail. Here are more details: recently (before the Yosemite public beta program started), I started getting more and more unfiltered spam in my iCloud inbox I first started noticing on iOS which does not appear to do any client-side spam filtering, but then at least my workaround is to load mail via Mavericks Mail. Mavericks' client side junk mail filtering cleans up the mess in my inbox reasonably well, from which the iOS devices benefit. Not as good as decent server-side spam filtering but at least it does the job albeit in a non-"premium experience" way not only does Yosemite (confirmed now in the GMC too) not clean the spam Mavericks took care of, when right clicking (a discrete method on Mavericks), with Yosemite Mail immediately the entire spam message is loaded including images, which is how spammers discover they have a confirmed target I also started forwarding spam to firstname.lastname@example.org since around the beginning of the Yosemite beta program and reported the issue to Apple via the support website and the Feedback Assistant in Yosemite since Beta 1. It is annoying to the point that I have been considering announcing to all my legit contacts that I'm switching back to an older Gmail account (which Android friends would get a good laugh from), which I pretty much had stopped using since iCloud started. Gmail handles spam very well on the server side, at least I have never had this issue on a much older & historically much more used mail account, but then the concern is what's Google doing with my data... As it stands, if I were to update all OS X machines to Yosemite (my sig only lists latest gen devices I own), I'd have to either ditch iCloud mail or manage a lot of spam per day manually. I have reported this issue to Apple since beta 1 and have been forwarding 100s of samples to email@example.com for months but still not a word back from Apple. Has anyone else been greatly annoyed by this &/or found solutions/workarounds?