There is relatively new anti-spam tool - Rspamd. I think, it worth to be integrated with Plesk as an alternative to SpamAssassin. It shows better performance as the author says here http://rspamd.com/misc/2016/03/03/rspamd-performance.html
Thank you for your input! We will consider this functionality in upcoming releases, if it will be popular.
Everyone, please continue voting for this feature if you consider it important.
+1 very good addition to plesk
I want to use Rspamd on Plesk
Katharina Knuth commented
+1 that would be great
Please add this, RSPAMD much better than Spamassassin
Wauther Königs commented
It would be so nice to have it. RSPAMD is pretty effectful.
I use it on some machines.
But I want to install it on a customer's server.
Wilhelm Ahrendt commented
I want it! It's pain in the as to config the web ui on a server runs with plesk!
Tried and seems to be better than SpamAssassin, here is their comparison: https://rspamd.com/comparison.html
It has an embedded web (html/js) interface.
Christian Heutger commented
I would welcome rspamd. SA needs very much tweaks (additional to post-greet and rbl tweaks on postfix) to get close: Pyzor, Razor(2), DCC, adjustable/addable different rulesets, special plugins, GeoIP filtering, bayes could be fed with spam by spam archives like http://artinvoice.hu/spams/, should be tweaked by KAM rules etc. Look at my post on Proxmox Mail Gateway which is an antispam gateway, but also need tweaks. Great would be to have all of this in Plesk. A global bayes database for all Plesk users may help.
SA could be made better with adding global bayes database support, Pyzon etc also.