I believe spammers actively test their messages against things like SpamAssassin to sneak them through.
With Gmail you hardly see any spam.
>Still, some spam messages get through.
Some? Back in the day it was in the hundreds every day if you were active online...
The ones that drive me nuts (and have led me to having to sign up to fastmail for my business emails, rather than sending from my own shared server) are the ones that are valid responses to emails sent from GMail in the first place. Excellent logic (or lack thereof), Google.
I don't actually believe so, but I have often wondered whether GMail has such an overly fastiduous spam filter simply to encourage people into its fold... .
That is not the content based plan for spam PG describes.
And it comes at a cost. Complete loss of control over your inbox.
I use Office 365 and Gmail. Both do a good job.
...it did not work out.
17 years later and spam is still annoying. I use ThunderBird and tag every spam message as spam.
Still, some spam messages get through.
And because there are false positives sometimes, I always look through my spam folder before I empty it.