Fix smtp transport certificate-verification option matching to use correct host

Fix certificate name verification done with tls_try_verify_hosts

Affected tls_verify_hosts, tls_try_verify_hosts, tls_verify_cert_hostnames.

10 files changed, 128 insertions, 64 deletions

diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt
index f6529c6e2..d57cbf903 100644
--- a/doc/doc-txt/experimental-spec.txt
+++ b/doc/doc-txt/experimental-spec.txt
@@ -1173,7 +1173,7 @@ component FQDN).
 The equivalent check on the server for client certificates is not
 implemented.  At least one major email provider is using a client
 certificate which fails this check.  They do not retry either without
-hte client certificate or in clear.
+the client certificate or in clear.
 
 It is possible to duplicate the effect of this checking by
 creative use of Events.
diff --git a/src/src/tls-gnu.c b/src/src/tls-gnu.c
index 093b3a375..9d72ebc66 100644
--- a/src/src/tls-gnu.c
+++ b/src/src/tls-gnu.c
@@ -75,11 +75,7 @@ Changes:
 /* Values for verify_requirement */
 
 enum peer_verify_requirement
-  { VERIFY_NONE, VERIFY_OPTIONAL, VERIFY_REQUIRED
-#ifdef EXPERIMENTAL_CERTNAMES
-    ,VERIFY_WITHHOST
-#endif
-  };
+  { VERIFY_NONE, VERIFY_OPTIONAL, VERIFY_REQUIRED };
 
 /* This holds most state for server or client; with this, we can set up an
 outbound TLS-enabled connection in an ACL callout, while not stomping all
@@ -1390,7 +1386,7 @@ if (rc < 0 ||
 else
   {
 #ifdef EXPERIMENTAL_CERTNAMES
-  if (state->verify_requirement == VERIFY_WITHHOST)
+  if (state->exp_tls_verify_cert_hostnames)
     {
     int sep = 0;
     uschar * list = state->exp_tls_verify_cert_hostnames;
@@ -1402,9 +1398,13 @@ else
       {
       DEBUG(D_tls)
 	debug_printf("TLS certificate verification failed: cert name mismatch\n");
-      gnutls_alert_send(state->session,
-	GNUTLS_AL_FATAL, GNUTLS_A_BAD_CERTIFICATE);
-      return FALSE;
+      if (state->verify_requirement >= VERIFY_REQUIRED)
+	{
+	gnutls_alert_send(state->session,
+	  GNUTLS_AL_FATAL, GNUTLS_A_BAD_CERTIFICATE);
+	return FALSE;
+	}
+      return TRUE;
       }
     }
 #endif
@@ -1771,6 +1771,23 @@ return OK;
 
 
 
+#ifdef EXPERIMENTAL_CERTNAMES
+static void
+tls_client_setup_hostname_checks(host_item * host, exim_gnutls_state_st * state,
+  smtp_transport_options_block * ob)
+{
+if (verify_check_this_host(&ob->tls_verify_cert_hostnames, NULL,
+	    host->name, host->address, NULL) == OK)
+  {
+  state->exp_tls_verify_cert_hostnames = host->name;
+  DEBUG(D_tls)
+    debug_printf("TLS: server cert verification includes hostname: \"%s\".\n",
+		    state->exp_tls_verify_cert_hostnames);
+  }
+}
+#endif
+
+
 /*************************************************
 *    Start a TLS session in a client             *
 *************************************************/
@@ -1837,35 +1854,28 @@ if ((rc = tls_init(host, ob->tls_certificate, ob->tls_privatekey,
 set but both tls_verify_hosts and tls_try_verify_hosts are unset. Check only
 the specified host patterns if one of them is defined */
 
-if ((  state->exp_tls_verify_certificates
-    && !ob->tls_verify_hosts
-    && !ob->tls_try_verify_hosts
-    )
-    ||
-    verify_check_host(&ob->tls_verify_hosts) == OK
+if (  (  state->exp_tls_verify_certificates
+      && !ob->tls_verify_hosts
+      && !ob->tls_try_verify_hosts
+      )
+    || verify_check_this_host(&ob->tls_verify_hosts, NULL,
+	      host->name, host->address, NULL) == OK
    )
   {
 #ifdef EXPERIMENTAL_CERTNAMES
-  if (verify_check_host(&ob->tls_verify_cert_hostnames) == OK)
-    {
-    DEBUG(D_tls)
-      debug_printf("TLS: server cert incl. hostname verification required.\n");
-    state->verify_requirement = VERIFY_WITHHOST;
-    state->exp_tls_verify_cert_hostnames = host->name;
-    DEBUG(D_tls) debug_printf("Cert hostname to check: \"%s\"\n",
-		      state->exp_tls_verify_cert_hostnames);
-    }
-  else
+  tls_client_setup_hostname_checks(host, state, ob);
 #endif
-    {
-    DEBUG(D_tls)
-      debug_printf("TLS: server certificate verification required.\n");
-    state->verify_requirement = VERIFY_REQUIRED;
-    }
+  DEBUG(D_tls)
+    debug_printf("TLS: server certificate verification required.\n");
+  state->verify_requirement = VERIFY_REQUIRED;
   gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUIRE);
   }
-else if (verify_check_host(&ob->tls_try_verify_hosts) == OK)
+else if (verify_check_this_host(&ob->tls_try_verify_hosts, NULL,
+	      host->name, host->address, NULL) == OK)
   {
+#ifdef EXPERIMENTAL_CERTNAMES
+  tls_client_setup_hostname_checks(host, state, ob);
+#endif
   DEBUG(D_tls)
     debug_printf("TLS: server certificate verification optional.\n");
   state->verify_requirement = VERIFY_OPTIONAL;
diff --git a/src/src/tls-openssl.c b/src/src/tls-openssl.c
index 628860044..b1094b1c2 100644
--- a/src/src/tls-openssl.c
+++ b/src/src/tls-openssl.c
@@ -1683,31 +1683,30 @@ int rc;
    set but both tls_verify_hosts and tls_try_verify_hosts is not set. Check only
    the specified host patterns if one of them is defined */
 
-if ((!ob->tls_verify_hosts && !ob->tls_try_verify_hosts) ||
-    (verify_check_host(&ob->tls_verify_hosts) == OK))
-  {
-  if ((rc = setup_certs(ctx, ob->tls_verify_certificates,
-	ob->tls_crl, host, FALSE, verify_callback_client)) != OK)
-    return rc;
+if (  (!ob->tls_verify_hosts && !ob->tls_try_verify_hosts)
+   || (verify_check_this_host(&ob->tls_verify_hosts, NULL,
+		host->name, host->address, NULL) == OK)
+   )
   client_verify_optional = FALSE;
+else if (verify_check_this_host(&ob->tls_try_verify_hosts, NULL,
+		host->name, host->address, NULL) == OK)
+  client_verify_optional = TRUE;
+else
+  return OK;
+
+if ((rc = setup_certs(ctx, ob->tls_verify_certificates,
+      ob->tls_crl, host, client_verify_optional, verify_callback_client)) != OK)
+  return rc;
 
 #ifdef EXPERIMENTAL_CERTNAMES
-  if (verify_check_host(&ob->tls_verify_cert_hostnames) == OK)
-    {
-    cbinfo->verify_cert_hostnames = host->name;
-    DEBUG(D_tls) debug_printf("Cert hostname to check: \"%s\"\n",
-		      cbinfo->verify_cert_hostnames);
-    }
-#endif
-  }
-else if (verify_check_host(&ob->tls_try_verify_hosts) == OK)
+if (verify_check_this_host(&ob->tls_verify_cert_hostnames, NULL,
+	      host->name, host->address, NULL) == OK)
   {
-  if ((rc = setup_certs(ctx, ob->tls_verify_certificates,
-	ob->tls_crl, host, TRUE, verify_callback_client)) != OK)
-    return rc;
-  client_verify_optional = TRUE;
+  cbinfo->verify_cert_hostnames = host->name;
+  DEBUG(D_tls) debug_printf("Cert hostname to check: \"%s\"\n",
+		    cbinfo->verify_cert_hostnames);
   }
-
+#endif
 return OK;
 }
 
diff --git a/test/confs/5440 b/test/confs/5440
index 01ba52532..95c434549 100644
--- a/test/confs/5440
+++ b/test/confs/5440
@@ -88,6 +88,11 @@ client_s:
   retry_use_local_part
   transport = send_to_server_req_passname
 
+client_t:
+  driver = accept
+  local_parts = usert
+  retry_use_local_part
+  transport = send_to_server_req_failcarryon
 
 # ----- Transports -----
 
@@ -172,4 +177,18 @@ send_to_server_req_passname:
   tls_verify_cert_hostnames = *
   tls_verify_hosts = *
 
+# this will fail to verify the cert name but carry on (try-verify mode)
+# fail because the cert is "server1.example.com" and the test system is something else
+send_to_server_req_failcarryon:
+  driver = smtp
+  allow_localhost
+  hosts = HOSTNAME
+  port = PORT_D
+  tls_certificate = CERT2
+  tls_privatekey = CERT2
+
+  tls_verify_certificates = CA1
+  tls_verify_cert_hostnames = *
+  tls_try_verify_hosts = *
+
 # End
diff --git a/test/confs/5450 b/test/confs/5450
index dd42a3fb1..953b47423 100644
--- a/test/confs/5450
+++ b/test/confs/5450
@@ -88,6 +88,12 @@ client_s:
   retry_use_local_part
   transport = send_to_server_req_passname
 
+client_t:
+  driver = accept
+  local_parts = usert
+  retry_use_local_part
+  transport = send_to_server_req_failcarryon
+
 
 # ----- Transports -----
 
@@ -172,4 +178,16 @@ send_to_server_req_passname:
   tls_verify_cert_hostnames = *
   tls_verify_hosts = *
 
+send_to_server_req_failcarryon:
+  driver = smtp
+  allow_localhost
+  hosts = HOSTNAME
+  port = PORT_D
+  tls_certificate = CERT2
+  tls_privatekey = CERT2
+
+  tls_verify_certificates = CA1
+  tls_verify_cert_hostnames = *
+  tls_try_verify_hosts = *
+
 # End
diff --git a/test/log/5440 b/test/log/5440
index f084e82a9..44cec64b1 100644
--- a/test/log/5440
+++ b/test/log/5440
@@ -1,17 +1,21 @@
 1999-03-02 09:44:33 10HmaX-0005vi-00 <= CALLER@myhost.test.ex U=CALLER P=local S=sss
 1999-03-02 09:44:33 10HmaY-0005vi-00 <= CALLER@myhost.test.ex U=CALLER P=local S=sss
+1999-03-02 09:44:33 10HmaZ-0005vi-00 <= CALLER@myhost.test.ex U=CALLER P=local S=sss
 1999-03-02 09:44:33 Start queue run: pid=pppp -qf
 1999-03-02 09:44:33 10HmaX-0005vi-00 H=the.local.host.name [ip4.ip4.ip4.ip4] TLS error on connection (certificate verification failed)
 1999-03-02 09:44:33 10HmaX-0005vi-00 TLS session failure: delivering unencrypted to the.local.host.name [ip4.ip4.ip4.ip4] (not in hosts_require_tls)
-1999-03-02 09:44:33 10HmaX-0005vi-00 => userr@test.ex R=client_r T=send_to_server_req_failname H=the.local.host.name [ip4.ip4.ip4.ip4] C="250 OK id=10HmaZ-0005vi-00"
+1999-03-02 09:44:33 10HmaX-0005vi-00 => userr@test.ex R=client_r T=send_to_server_req_failname H=the.local.host.name [ip4.ip4.ip4.ip4] C="250 OK id=10HmbA-0005vi-00"
 1999-03-02 09:44:33 10HmaX-0005vi-00 Completed
-1999-03-02 09:44:33 10HmaY-0005vi-00 => users@test.ex R=client_s T=send_to_server_req_passname H=server1.example.com [ip4.ip4.ip4.ip4] X=TLS1.x:xxxxRSA_AES_256_CBC_SHAnnn:256 CV=yes DN="CN=server1.example.com" C="250 OK id=10HmbA-0005vi-00"
+1999-03-02 09:44:33 10HmaY-0005vi-00 => users@test.ex R=client_s T=send_to_server_req_passname H=server1.example.com [ip4.ip4.ip4.ip4] X=TLS1.x:xxxxRSA_AES_256_CBC_SHAnnn:256 CV=yes DN="CN=server1.example.com" C="250 OK id=10HmbB-0005vi-00"
 1999-03-02 09:44:33 10HmaY-0005vi-00 Completed
+1999-03-02 09:44:33 10HmaZ-0005vi-00 => usert@test.ex R=client_t T=send_to_server_req_failcarryon H=the.local.host.name [ip4.ip4.ip4.ip4] X=TLS1.x:xxxxRSA_AES_256_CBC_SHAnnn:256 CV=no DN="CN=server1.example.com" C="250 OK id=10HmbC-0005vi-00"
+1999-03-02 09:44:33 10HmaZ-0005vi-00 Completed
 1999-03-02 09:44:33 End queue run: pid=pppp -qf
 
 ******** SERVER ********
 1999-03-02 09:44:33 exim x.yz daemon started: pid=pppp, no queue runs, listening for SMTP on port 1225
 1999-03-02 09:44:33 TLS error on connection from the.local.host.name [ip4.ip4.ip4.ip4] (recv): A TLS fatal alert has been received.: Certificate is bad
 1999-03-02 09:44:33 TLS error on connection from the.local.host.name [ip4.ip4.ip4.ip4] (send): The specified session has been invalidated for some reason.
-1999-03-02 09:44:33 10HmaZ-0005vi-00 <= CALLER@myhost.test.ex H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtp S=sss id=E10HmaX-0005vi-00@myhost.test.ex
-1999-03-02 09:44:33 10HmbA-0005vi-00 <= CALLER@myhost.test.ex H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtps X=TLS1.x:xxxxRSA_AES_256_CBC_SHAnnn:256 CV=yes DN="C=UK,O=The Exim Maintainers,OU=Test Suite,CN=Phil Pennock" S=sss id=E10HmaY-0005vi-00@myhost.test.ex
+1999-03-02 09:44:33 10HmbA-0005vi-00 <= CALLER@myhost.test.ex H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtp S=sss id=E10HmaX-0005vi-00@myhost.test.ex
+1999-03-02 09:44:33 10HmbB-0005vi-00 <= CALLER@myhost.test.ex H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtps X=TLS1.x:xxxxRSA_AES_256_CBC_SHAnnn:256 CV=yes DN="C=UK,O=The Exim Maintainers,OU=Test Suite,CN=Phil Pennock" S=sss id=E10HmaY-0005vi-00@myhost.test.ex
+1999-03-02 09:44:33 10HmbC-0005vi-00 <= CALLER@myhost.test.ex H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtps X=TLS1.x:xxxxRSA_AES_256_CBC_SHAnnn:256 CV=yes DN="C=UK,O=The Exim Maintainers,OU=Test Suite,CN=Phil Pennock" S=sss id=E10HmaZ-0005vi-00@myhost.test.ex
diff --git a/test/log/5450 b/test/log/5450
index d56307a19..2cd0960b2 100644
--- a/test/log/5450
+++ b/test/log/5450
@@ -1,28 +1,34 @@
 1999-03-02 09:44:33 10HmaX-0005vi-00 <= CALLER@myhost.test.ex U=CALLER P=local S=sss
 1999-03-02 09:44:33 10HmaY-0005vi-00 <= CALLER@myhost.test.ex U=CALLER P=local S=sss
 1999-03-02 09:44:33 10HmaZ-0005vi-00 <= CALLER@myhost.test.ex U=CALLER P=local S=sss
+1999-03-02 09:44:33 10HmbA-0005vi-00 <= CALLER@myhost.test.ex U=CALLER P=local S=sss
 1999-03-02 09:44:33 Start queue run: pid=pppp -qf
 1999-03-02 09:44:33 10HmaX-0005vi-00 SSL verify error: depth=0 error=unable to get local issuer certificate cert=/CN=server1.example.com
 1999-03-02 09:44:33 10HmaX-0005vi-00 H=the.local.host.name [ip4.ip4.ip4.ip4] TLS error on connection (SSL_connect): error: <<detail omitted>>
 1999-03-02 09:44:33 10HmaX-0005vi-00 TLS session failure: delivering unencrypted to the.local.host.name [ip4.ip4.ip4.ip4] (not in hosts_require_tls)
-1999-03-02 09:44:33 10HmaX-0005vi-00 => userq@test.ex R=client_q T=send_to_server_req_fail H=the.local.host.name [ip4.ip4.ip4.ip4] C="250 OK id=10HmbA-0005vi-00"
+1999-03-02 09:44:33 10HmaX-0005vi-00 => userq@test.ex R=client_q T=send_to_server_req_fail H=the.local.host.name [ip4.ip4.ip4.ip4] C="250 OK id=10HmbB-0005vi-00"
 1999-03-02 09:44:33 10HmaX-0005vi-00 Completed
 1999-03-02 09:44:33 10HmaY-0005vi-00 SSL verify error: certificate name mismatch: "/CN=server1.example.com"
 
 1999-03-02 09:44:33 10HmaY-0005vi-00 H=the.local.host.name [ip4.ip4.ip4.ip4] TLS error on connection (SSL_connect): error: <<detail omitted>>
 1999-03-02 09:44:33 10HmaY-0005vi-00 TLS session failure: delivering unencrypted to the.local.host.name [ip4.ip4.ip4.ip4] (not in hosts_require_tls)
-1999-03-02 09:44:33 10HmaY-0005vi-00 => userr@test.ex R=client_r T=send_to_server_req_failname H=the.local.host.name [ip4.ip4.ip4.ip4] C="250 OK id=10HmbB-0005vi-00"
+1999-03-02 09:44:33 10HmaY-0005vi-00 => userr@test.ex R=client_r T=send_to_server_req_failname H=the.local.host.name [ip4.ip4.ip4.ip4] C="250 OK id=10HmbC-0005vi-00"
 1999-03-02 09:44:33 10HmaY-0005vi-00 Completed
-1999-03-02 09:44:33 10HmaZ-0005vi-00 => users@test.ex R=client_s T=send_to_server_req_passname H=server1.example.com [ip4.ip4.ip4.ip4] X=TLSv1:AES256-SHA:256 CV=yes DN="/CN=server1.example.com" C="250 OK id=10HmbC-0005vi-00"
+1999-03-02 09:44:33 10HmaZ-0005vi-00 => users@test.ex R=client_s T=send_to_server_req_passname H=server1.example.com [ip4.ip4.ip4.ip4] X=TLSv1:AES256-SHA:256 CV=yes DN="/CN=server1.example.com" C="250 OK id=10HmbD-0005vi-00"
 1999-03-02 09:44:33 10HmaZ-0005vi-00 Completed
+1999-03-02 09:44:33 10HmbA-0005vi-00 SSL verify error: certificate name mismatch: "/CN=server1.example.com"
+
+1999-03-02 09:44:33 10HmbA-0005vi-00 => usert@test.ex R=client_t T=send_to_server_req_failcarryon H=the.local.host.name [ip4.ip4.ip4.ip4] X=TLSv1:AES256-SHA:256 CV=no DN="/CN=server1.example.com" C="250 OK id=10HmbE-0005vi-00"
+1999-03-02 09:44:33 10HmbA-0005vi-00 Completed
 1999-03-02 09:44:33 End queue run: pid=pppp -qf
 
 ******** SERVER ********
 1999-03-02 09:44:33 exim x.yz daemon started: pid=pppp, no queue runs, listening for SMTP on port 1225
 1999-03-02 09:44:33 TLS error on connection from the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] (SSL_accept): error: <<detail omitted>>
 1999-03-02 09:44:33 TLS client disconnected cleanly (rejected our certificate?)
-1999-03-02 09:44:33 10HmbA-0005vi-00 <= CALLER@myhost.test.ex H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtp S=sss id=E10HmaX-0005vi-00@myhost.test.ex
+1999-03-02 09:44:33 10HmbB-0005vi-00 <= CALLER@myhost.test.ex H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtp S=sss id=E10HmaX-0005vi-00@myhost.test.ex
 1999-03-02 09:44:33 TLS error on connection from the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] (SSL_accept): error: <<detail omitted>>
 1999-03-02 09:44:33 TLS client disconnected cleanly (rejected our certificate?)
-1999-03-02 09:44:33 10HmbB-0005vi-00 <= CALLER@myhost.test.ex H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtp S=sss id=E10HmaY-0005vi-00@myhost.test.ex
-1999-03-02 09:44:33 10HmbC-0005vi-00 <= CALLER@myhost.test.ex H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtps X=TLSv1:AES256-SHA:256 CV=yes DN="/C=UK/O=The Exim Maintainers/OU=Test Suite/CN=Phil Pennock" S=sss id=E10HmaZ-0005vi-00@myhost.test.ex
+1999-03-02 09:44:33 10HmbC-0005vi-00 <= CALLER@myhost.test.ex H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtp S=sss id=E10HmaY-0005vi-00@myhost.test.ex
+1999-03-02 09:44:33 10HmbD-0005vi-00 <= CALLER@myhost.test.ex H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtps X=TLSv1:AES256-SHA:256 CV=yes DN="/C=UK/O=The Exim Maintainers/OU=Test Suite/CN=Phil Pennock" S=sss id=E10HmaZ-0005vi-00@myhost.test.ex
+1999-03-02 09:44:33 10HmbE-0005vi-00 <= CALLER@myhost.test.ex H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtps X=TLSv1:AES256-SHA:256 CV=yes DN="/C=UK/O=The Exim Maintainers/OU=Test Suite/CN=Phil Pennock" S=sss id=E10HmbA-0005vi-00@myhost.test.ex
diff --git a/test/scripts/5440-certnames-GnuTLS/5440 b/test/scripts/5440-certnames-GnuTLS/5440
index 2a61eb1d0..f43d18de4 100644
--- a/test/scripts/5440-certnames-GnuTLS/5440
+++ b/test/scripts/5440-certnames-GnuTLS/5440
@@ -10,6 +10,10 @@ Testing
 exim users@test.ex
 Testing
 ****
+# this will fail to verify the cert name but carry on (try-verify mode)
+exim usert@test.ex
+Testing
+****
 exim -qf
 ****
 killdaemon
diff --git a/test/scripts/5450-certnames-OpenSSL/5450 b/test/scripts/5450-certnames-OpenSSL/5450
index 5359096b1..3b2221c9c 100644
--- a/test/scripts/5450-certnames-OpenSSL/5450
+++ b/test/scripts/5450-certnames-OpenSSL/5450
@@ -13,6 +13,10 @@ Testing
 exim users@test.ex
 Testing
 ****
+# this will fail to verify the cert name but carry on (try-verify mode)
+exim usert@test.ex
+Testing
+****
 exim -qf
 ****
 killdaemon
diff --git a/test/stderr/5420 b/test/stderr/5420
index 64dfc0b12..464cb2c4d 100644
--- a/test/stderr/5420
+++ b/test/stderr/5420
@@ -81,8 +81,8 @@ expanding: ${if eq {$address_data}{userz}{*}{:}}
 127.0.0.1 in hosts_verify_avoid_tls? no (end of list)
   SMTP>> STARTTLS
   SMTP<< 220 TLS go ahead
- in tls_verify_hosts? no (option unset)
- in tls_try_verify_hosts? no (option unset)
+127.0.0.1 in tls_verify_hosts? no (option unset)
+127.0.0.1 in tls_try_verify_hosts? no (option unset)
   SMTP>> EHLO myhost.test.ex
   SMTP<< 250-myhost.test.ex Hello the.local.host.name [ip4.ip4.ip4.ip4]
          250-SIZE 52428800