Disabling system users from mail

[Andrei Petru Mura]

I'm using dovecot 2.2.36 on CentOS 7.7.
My configurations are (dovecot -n):

disable_plaintext_auth = no
first_valid_uid = 1000
mail_location = maildir:~/Maildir
mbox_write_locks = fcntl
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
}
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
}
ssl = required
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key =  # hidden, use -P to show it

I want to disable accounts for system users. Only virtual users will have
accounts (not configured yet). Is this possible?

Thanks,
Mura Andrei
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