there should be more easy way for spam system to learn.
Something like forward SPAM mail to some firstname.lastname@example.org mail which will after that block all mails from the same sender.
fro example I forward mail from email@example.com to firstname.lastname@example.org and after that I will never get any mail anymore from email@example.com
Now I need to manually edit file and adding spam mails to it.
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There is currently a problem with zmtrainsa (i.i. it is not currently working) so it's not as effective as it should be and Zimbra are supposed to be working on a fix. This sort of block is trivial in rspamd, it consists of adding the domain to a config file (done via the rspamd ui).