If one has access to the server, one may use 'dnsbl' for helping in scoring messages by spamassassin. So these dnsbl's do not block without informing but move emails recognized as spam to the spam folder. If the email was ham and therefore a false positive, the user can move this email back to inbox or a subfolder not containing spams. Then perhaps plesk automatically trains spamassassin that this is not spam or one can integrate this action in a cron job.

Also hugely important: As I and other customers have many emails in other languages, for example spamhaus (URIBL_DBL_SPAM) produces many false positives. Bad is that as default spamassassin uses spamhaus.org as helper. After manually reducing the spam score, I and my customers have no false positives anymore.

How I manually have done it, is described here: https://talk.plesk.com/threads/possible-to-use-dnsbls-for-moving-identified-email-as-spam-to-spam-folder-not-blocking.375318/post-951518

Please !!! The users really need to configure bad words filter for incoming mails to delete or put to spam folder !!!

Would be great to create a list of words, phrases and stuff like that for assassination.
An optional REGEXP option would be greatly appreciated with this.

Yes please, im tired of seeing messages about penises, vaginas, blue pills, etc...

Add functionality to configure SpamAssassin to mark messages hit by DNS blackhole lists, instead of rejecting

Additional Keywords in Subject/Body with custom scoring would be great.

i think it would be to strange, to config all details of spamassassin with the plesk GUI. most Things are to complex.

More optiones like disbaled or enables score by RDNS_NONE , URIBL_BLOCKED und URIBL_DBL_SPAM

Rules like this…

If xxxx in subject then rule score 5
If yyyy in subject then rule score 3
If vvvv in body then rule score 4

And minus values would be helpful too
If zzzz in body then rule score -5

I have to fight with those Options: RDNS_NONE, SERGIO_SUBJECT_VIAGRA01, URIBL_BLOCKED und URIBL_DBL_SPAM

I would block last 4 of them completely, but my Datacenter told me that there is no way during Plesk gives no configuration Option...

Rules like this…

If xxxx in subject then rule score 5
If yyyy in subject then rule score 3
If vvvv in body then rule score 4

And minus values would be helpful too
If zzzz in body then rule score -5

Enable/disable per server/subscription/domain/mailbox, features such as:
Greylisting and custom rules

EG:
If Viagra in the subject/body/header - increase score by 10

Filter Subject and/or Body by keyword(s) / phrase(s)