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Add sieve rule

Move spam mails to inbox Spam folder (and create it if not already exist)

Edit /etc/dovecot/sieve/default.sieve

require ["fileinto", "mailbox"];                                                                                                                                                                                                                                                          
                                                                                                                                                                                                                                                                                          
if header :contains "X-Spam-Flag" "YES" {                                                                                                                                                                                                                                                 
    fileinto :create "INBOX.Spam";                                                                                                                                                                                                                                                        
    stop;                                                                                                                                                                                                                                                                                 
}

Move emails with "Event alarm" subject to inbox EventAlarm folder

Edit /etc/dovecot/sieve/default.sieve

require ["fileinto", "mailbox"];                                                                                                                                                                                                                                                          
                                                                                                                                                                                                                                                                                          
if header :contains "Subject" "Event alarm" {                                                                                             
    fileinto :create "INBOX.EventAlarm";                                                                                                  
    stop;                              
}