Hi Gunther,
The email log was interpreting those symbols as "unsafe" HTML (i.e. an attempt at cross-site scripting); this paranoia in this case isn't necessary as messages are plain text only. There is a fix at
http://pkp.sfu.ca/bugzilla/show_bug.cgi?id=2673 that will relax the restriction. Note that the full emails are stored properly; once the fix is in place, the rest of the any affected past emails will appear.
Regards,
Alec Smecher
Open Journal Systems Team
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July 11 - 13, 2007, Vancouver, BC, Canada
http://ocs.sfu.ca/pkp2007/