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-
starttls
??? 220
noop
+????554 Security failure
+noop
??? 554 Security failure
quit
????554 Security failure
-??? 221
+????221
???*
****
### No certificate, certificate optional at TLS time, required by ACL
starttls
??? 220
noop
+????554 Security failure
+noop
??? 554 Security failure
****
### Bad certificate, certificate optional at TLS time, reject at ACL time
starttls
??? 220
noop
+????554 Security failure
+noop
??? 554 Security failure
****
### Revoked certificate, certificate optional at TLS time, reject at ACL time