[exim] 'verify=helo' and strange warning...

I've a simple 'warn' ACL:

  warn
    add_header = X-HELO-Warning: Remote host $sender_host_address ${if def:sender_host_name {($sender_host_name) }}incorrectly presented itself as $sender_helo_name
    log_message = Remote host presented unverifiable HELO/EHLO greeting
    hosts = !+relay_from_hosts
    !verify = helo

but emits warning like:

    X-HELO-Warning: Remote host 89.185.230.205 (smtp5.mailing.easy.cz) incorrectly presented itself as smtp5.mailing.easy.cz

that seems a bit strange to me. Why?


Thanks.

-- 
  Mi piaccion le fiabe
  raccontane altre                    (F. Guccini)