Do you run your own mail server and, if so, how easy or hard is to keep on top of spam?
I've heard that it's impossible unless you're BigCo because there's so much spam, but I have an old uni dept email where they recently migrated off of their own server and I never had an issue with spam when they were running the show.
And likewise for when I ran my own spam filters on my email client on a server without spam filtering.
How are these small solutions so good if this problem is impossible?