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Hi everybody! I have solved the problem recently posted, with
charset=ISO-8859-1.
What I did is edit roundcube/program/main.inc and there in line 392, I
added this:
/MBSTRING_ENCODING = array("ISO-8859-1", "UTF-7", "UTF7-IMAP", "UTF-8",
                                   "ISO-2022-JP", "EUC-JP", "EUCJP-WIN",
                                   "SJIS", "SJIS-WIN",*"ISO-8859-15")*;
/Note that this function if php supoort mbstring.

Thanks everybody! roundcube rules! ;)
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