[exim] non-printing character in expansion

Hi !!

I have setup a transport for out-of-the-office auto replies set that
way:

vacation_transport:
    driver = autoreply
    text = $address_data
    to = $reply_address
    subject = Auto: $h_subject:
    from = $local_part@$domain
    headers = Precedence: Bulk\nReferences: $h_message-id:

but some subjects like this one:

Subject: =?iso-8859-1?Q?Campa=F1a_Hesperia_WiFi_gratis_en_Aeropuertos?=

produce that errors:

    Expansion of "Auto: $h_subject:" in vacation_transport transport
contains non-printing character 241

is there any way to fix this ? is really a problem on the subject ?

--
Thanx & best regards ...

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