>>Is there any *formal* standard (such as a RFC) that says that? >http://www.cis.ohio-state.edu/htbin/rfc/rfc2110.html This one is obsoleted by RFC 2557 (ftp://ftp.isi.edu/in-notes/rfc2557.txt), with a current status of proposed standard. Xavi --- Foghorns blowing in the night, salt sea in the morning breeze, driving cars all allong the coastline... This must be what paradise is like