$ sendmail -bt -d0.1
-------------------------
APPENDDEF(`conf_sendmail_ENVDEF', `-DSTARTTLS') 
APPENDDEF(`conf_sendmail_LIBS', `-lssl -lcrypto')
-------------------------
# ./Build -c && ./Build install
-------------------------
define(`confCACERT_PATH', `/etc/mail/certs')
define(`confCACERT', `/etc/mail/certs/cacert.pem')
define(`confSERVER_CERT', `/etc/mail/certs/cert.pem')
define(`confSERVER_KEY', `/etc/mail/certs/key.pem')
define(`confCLIENT_CERT', `/etc/mail/certs/cert.pem')
define(`confCLIENT_KEY', `/etc/mail/certs/key.pem')
-------------------------
# telnet localhost smtp
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 mail.example.com ESMTP Sendmail 8.12.9/8.12.9; 
Sun, 11 Jan 2004 12:07:43 -0800 (PST)
ehlo localhost
250-mail.example.com Hello IDENT:6l4ZhaGP3Qczqknqm/KdTFGsrBe2SCYC@localhost 
[127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-EXPN
250-VERB
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-AUTH DIGEST-MD5 CRAM-MD5
250-STARTTLS
250-DELIVERBY
250 HELP
QUIT
221 2.0.0 mail.example.com closing connection
Connection closed by foreign host.
