NOTE: When using the SpamAss Milter (and very possibly MIMEDefang), users that are using Inflex in conjunction with sendmail need to rerun their Inflex setup to create a new inflex.cf file. This is to update the Xspamassassin filter which was added to sendmail.mc and converted to sendmail.cf. In short: 1) echo "INPUT_MAIL_FILTER(\`spamassassin', \`S=local:/var/run/spammilter/spamass.sock, F=, T=C:15m;S:4m;R:4m;E:10m')" >> /etc/mail/sendmail.mc 2) m4 sendmail.mc > sendmail.cf 3) Rerun inflex setup. Thanks to Tielman Koekemoer for the note!