exim -DSERVER=server -bd -oX PORT_D
****
### No certificate, certificate required
-client-ssl HOSTIPV4 PORT_D
+client-ssl -t2 HOSTIPV4 PORT_D
??? 220
ehlo rhu.barb
??? 250-
??? 250
starttls
??? 220
+noop
+????554 Security failure
+noop
+??? 554 Security failure
+quit
+????554 Security failure
+????221
+???*
****
### No certificate, certificate optional at TLS time, required by ACL
client-ssl 127.0.0.1 PORT_D
??? 250
starttls
??? 220
+noop
+????554 Security failure
+noop
+??? 554 Security failure
****
### Bad certificate, certificate optional at TLS time, reject at ACL time
client-ssl 127.0.0.1 PORT_D aux-fixed/exim-ca/example.net/server1.example.net/server1.example.net.chain.pem aux-fixed/exim-ca/example.net/server1.example.net/server1.example.net.unlocked.key
??? 250
starttls
??? 220
+noop
+????554 Security failure
+noop
+??? 554 Security failure
****
### Revoked certificate, certificate optional at TLS time, reject at ACL time
client-ssl 127.0.0.1 PORT_D aux-fixed/exim-ca/example.com/revoked1.example.com/revoked1.example.com.chain.pem aux-fixed/exim-ca/example.com/revoked1.example.com/revoked1.example.com.unlocked.key