Raymond Norton said: > Can you telnet to port 25 of the server? I sure could. That was of no help. I looked at the sendmail.cf diff, but that was pretty cryptic. So I checked the logs... finally checking /var/log/maillog. There was a warning about STARTTLS that it couldn't find the ca-bundle, which is the root certificate authority bundle. STARTTLS failed, meaning I could not initiate a secure connection, and unsecure connections are refused. Apparently FC4 has moved the ca-bundle to /usr/share/apps/kssl/ca-bundle.crt and/or /etc/pki/tls/certs/ca-bundle.crt. It took a simple change to sendmail.mc to point to the first one, and now SMTP with a STARTTLS encryption wrapper works once again. Thanks for the tries, fellas.