Accents on vacation

Hello,

The fact is that when a user sets vacation in Horde and other user send
email with display name have accents "David Díaz [email protected]", server
reply with undeliverd mail
.
We have installed:

- Horde: 3.3.11
- Vacation: H3 (3.2.1)
- PHP Version: 5.1.6

 An example of this error:

----------------------------------------------------------------------------------

This is the mail system at host xxxxxx.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<[email protected]> (expanded from
    <=?ISO-8859-1?Q?Miguel_=C1ngel_Garc=EDa_Jim=E9nez?=>): unknown user:
    "=?iso-8859-1?q?miguel_=c1ngel_garc=eda_jim=e9nez?="
----------------------------------------------------------------------------------

Regards
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