We receive excessively high amount of UBE(Unsolicited Bulk Email), so
called spam, in these years.  Many researchers have contrived `spam
filter' which scans the body of email and decides whether it is spam or
not by statistical analysis.  However, it becomes problem that those
unnecessary computing load is raising and that receiving message
body for analyzing let spammers assume they succeeded in sending spam.
In this paper, we propose an SMTP wrapper which rejects unsolicited
emails by SMTP session parameters without seeing message body, and also
report the practical performance of its implementation, `antibadmail',
which is generic MTA wrapper specialized in bad mail rejection.  \\
{\bf Keywords:} spam rejection, SMTP session filter, SMTP wrapper
