However, I notice that a lot (and I mean really really a lot) of spam emails are being quarantined because of the spf rules (fail and soft fail) and most of those spam emails have a similar pattern: 

- a subject that contains certain words like 'can we meet' or 'hungry for you' and other crap..

- no text in the email body, but only a (base64 encoded) image containing an ad. 

- domainnames that are from some obscure tld like .ar or .icu or .pk and so on....

- specific ip ranges

- mails from certain regions (I do not know any companies from nigeria, just put it on blacklist)

I would really like to be able to permanantly reject emails that follow such a pattern. 

The most perfect way would be to set some 'permanently reject' rules that can be customized.

That way, with a bit of setup rules, I am sure that I can permanently reject a lot of emails without losing the ability to manually detect the 'false positives' spam-emails in the quarantine.