====== Add sieve rule ======

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

Edit /etc/dovecot/sieve/default.sieve

<code>
require ["fileinto", "mailbox"];

if header :contains "X-Spam-Flag" "YES" {
    fileinto :create "INBOX.Spam";
    stop;
} 
</code>

Recompile sieve configuration:
  sievec -D "/etc/dovecot/sieve/default.sieve"

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

Edit /etc/dovecot/sieve/default.sieve

<code>
require ["fileinto", "mailbox"];

if header :contains "Subject" "Event alarm" {
    fileinto :create "INBOX.EventAlarm";
    stop;
}
</code>

Recompile sieve configuration:
  sievec -D "/etc/dovecot/sieve/default.sieve"