From: =?utf-8?q?I=C3=B1aki_Baz_Castillo?= <[EMAIL PROTECTED]>

   So  I must be carefull and don't match comma between "", () or <> when 
   spliting the header raw text into various values.

Yes, in general you cannot split a header into parts without parsing
the parts.

   Is there other case in which a non escaped comma could appear?

Search for this string:

        ","

in section 25.1 of RFC 3261.  There are many occurrences.

Dale
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