On: Why it’s so hard to innovate in the e-mail space (2014)

[baudehlo]

Check out Haraka, built by an old SpamAssassin developer (ie me). It's all that and has custom anti-spam features like the Karma plugin too. It's in place at some large installs (eg craigslist, who went from 20 postfix servers to just 7 Haraka servers).

[feld → baudehlo]

I'll look into it, thanks!