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Keyhelp should utilise "per_user" bayes learns in some future release. Currently in statistics.conf there is default value of "min_learns = 200;" which is almost impossible to train Rspamd to this value.

This means that similar email would have to be learned 200 times before Rspamd moves it to Junk. Considering there is no chance spammer would be sending 200 emails with similar headers I suggest:

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in statistics.conf:

users_enabled = true;
per_user = true;
min_learns = 2;

Also in dovecot/conf.d/90-sieve.conf (or equivalent) in order to actually learn these email on-the-go (below is just example):

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plugin {

    sieve_plugins = sieve_imapsieve sieve_extprograms
    sieve_before = /var/vmail/mail/sieve/global/spam-global.sieve
    sieve = file:/var/vmail/mail/sieve/%d/%n/scripts;active=/var/vmail/mail/sieve/%d/%n/active-script.sieve

    imapsieve_mailbox1_name = Spam
    imapsieve_mailbox1_causes = COPY
    imapsieve_mailbox1_before = file:/var/vmail/mail/sieve/global/report-spam.sieve

    imapsieve_mailbox2_name = *
    imapsieve_mailbox2_from = Spam
    imapsieve_mailbox2_causes = COPY
    imapsieve_mailbox2_before = file:/var/vmail/mail/sieve/global/report-ham.sieve

    sieve_pipe_bin_dir = /usr/bin
    sieve_global_extensions = +vnd.dovecot.pipe
}

/var/vmail/mail/sieve/global/report-spam.sieve

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require ["vnd.dovecot.pipe", "copy", "imapsieve"];
pipe :copy "rspamc" ["learn_spam"];

/var/vmail/mail/sieve/global/report-ham.sieve

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require ["vnd.dovecot.pipe", "copy", "imapsieve"];
pipe :copy "rspamc" ["learn_ham"];

Also, currently you might have 1000 email users on server and all "share" same learns. Basically, it is wrong to assume what is Spam for User1 that is also Spam for User1

https://rspamd.com/doc/configuration/statistic.html

KeyHelp Community

Enable/Add Rspamd "per user" learn option

Enable/Add Rspamd "per user" learn option