This list does not really follow priority. * Implement support of CRL checking. OpenSSL 0.9.7 finally supports CRLs, so Postfix/TLS should support loading CRLs. * Cleanup the "pfixtls" special logging, so that it fits Wietses original "per site" decision to make debugging easier. * Move TLS based information from separate lines into Postfix's smtpd logging lines to make logfile analysis easier. * Check the "info_callback" for sensitive use. I already had to remove the "warning alert" issued on normal shutdown. Why is a warning issued for a normal shutdown?? * Introduce new tls_per_client table to achieve the same selective behaviour for incoming connections. * Introduce better support for "opportunistic" encryption: collect information about peers connecting; log warnings when the key changed etc. [I am not sure that I already have the best answers available.] * Find a way to use the certificates themselves instead of the fingerprints to allow certificate based relaying. The maintenance of the fingerprints is a nightmare.