Gitweb:
http://git.exim.org/exim.git/commitdiff/9940096804c9f3985ca3bc9d862cefa0daa29c96
Commit: 9940096804c9f3985ca3bc9d862cefa0daa29c96
Parent: 389ca47a59cc0247fcee8a50da42aa00af5f7a90
Author: Jeremy Harris <jgh146exb@???>
AuthorDate: Mon Jun 4 14:54:13 2012 +0100
Committer: Jeremy Harris <jgh146exb@???>
CommitDate: Mon Jun 4 14:57:04 2012 +0100
Add hosts_verify_avoid_tls option to smtp transport.
---
doc/doc-docbook/spec.xfpt | 7 ++
src/src/transports/smtp.c | 5 +
src/src/transports/smtp.h | 1 +
src/src/verify.c | 5 +-
test/confs/5410 | 5 +-
test/confs/5420 | 5 +-
test/log/5410 | 5 +
test/log/5420 | 5 +
test/scripts/5410-cutthrough-OpenSSL/5410 | 15 +++-
test/scripts/5420-cutthrough-GnuTLS/5420 | 14 +++-
test/stderr/5410 | 146 +++++++++++++++++++++++++++++
test/stderr/5420 | 146 +++++++++++++++++++++++++++++
test/stdout/5410 | 12 +++
test/stdout/5420 | 12 +++
14 files changed, 375 insertions(+), 8 deletions(-)
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index ee3193b..8584384 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -22302,6 +22302,13 @@ that matches this list, even if the server host advertises PIPELINING support.
Exim will not try to start a TLS session when delivering to any host that
matches this list. See chapter &<<CHAPTLS>>& for details of TLS.
+.option hosts_verify_avoid_tls smtp "host list&!!" *
+.cindex "TLS" "avoiding for certain hosts"
+Exim will not try to start a TLS session for a verify callout,
+or when delivering in cutthrough mode,
+to any host that matches this list.
+Note that the default is to not use TLS.
+
.option hosts_max_try smtp integer 5
.cindex "host" "maximum number to try"
diff --git a/src/src/transports/smtp.c b/src/src/transports/smtp.c
index a63f48f..94b8485 100644
--- a/src/src/transports/smtp.c
+++ b/src/src/transports/smtp.c
@@ -106,6 +106,10 @@ optionlist smtp_transport_options[] = {
#endif
{ "hosts_try_auth", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
+#ifdef SUPPORT_TLS
+ { "hosts_verify_avoid_tls", opt_stringptr,
+ (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
+#endif
{ "interface", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, interface) },
{ "keepalive", opt_bool,
@@ -170,6 +174,7 @@ smtp_transport_options_block smtp_transport_option_defaults = {
NULL, /* hosts_require_auth */
NULL, /* hosts_require_tls */
NULL, /* hosts_avoid_tls */
+ US"*", /* hosts_verify_avoid_tls */
NULL, /* hosts_avoid_pipelining */
NULL, /* hosts_avoid_esmtp */
NULL, /* hosts_nopass_tls */
diff --git a/src/src/transports/smtp.h b/src/src/transports/smtp.h
index 0676811..79f1b8c 100644
--- a/src/src/transports/smtp.h
+++ b/src/src/transports/smtp.h
@@ -23,6 +23,7 @@ typedef struct {
uschar *hosts_require_auth;
uschar *hosts_require_tls;
uschar *hosts_avoid_tls;
+ uschar *hosts_verify_avoid_tls;
uschar *hosts_avoid_pipelining;
uschar *hosts_avoid_esmtp;
uschar *hosts_nopass_tls;
diff --git a/src/src/verify.c b/src/src/verify.c
index 6e3e6a3..eaab14d 100644
--- a/src/src/verify.c
+++ b/src/src/verify.c
@@ -601,7 +601,10 @@ else
#ifdef SUPPORT_TLS
if (tls_offered &&
verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
- host->address, NULL) != OK)
+ host->address, NULL) != OK &&
+ verify_check_this_host(&(ob->hosts_verify_avoid_tls), NULL, host->name,
+ host->address, NULL) != OK
+ )
{
uschar buffer2[4096];
if ( !smtps
diff --git a/test/confs/5410 b/test/confs/5410
index aff16fa..576967c 100644
--- a/test/confs/5410
+++ b/test/confs/5410
@@ -1,4 +1,4 @@
-# Exim test configuration 5402
+# Exim test configuration 5410
exim_path = EXIM_PATH
host_lookup_order = bydns
@@ -52,7 +52,8 @@ smtp:
driver = smtp
interface = HOSTIPV4
port = PORT_D
- hosts_avoid_tls = ${if eq {$address_data}{usery}{*}{:}}
+ hosts_avoid_tls = ${if eq {$address_data}{usery}{*}{:}}
+ hosts_verify_avoid_tls = ${if eq {$address_data}{userz}{*}{:}}
# End
diff --git a/test/confs/5420 b/test/confs/5420
index aff16fa..2a7ebda 100644
--- a/test/confs/5420
+++ b/test/confs/5420
@@ -1,4 +1,4 @@
-# Exim test configuration 5402
+# Exim test configuration 5420
exim_path = EXIM_PATH
host_lookup_order = bydns
@@ -52,7 +52,8 @@ smtp:
driver = smtp
interface = HOSTIPV4
port = PORT_D
- hosts_avoid_tls = ${if eq {$address_data}{usery}{*}{:}}
+ hosts_avoid_tls = ${if eq {$address_data}{usery}{*}{:}}
+ hosts_verify_avoid_tls = ${if eq {$address_data}{userz}{*}{:}}
# End
diff --git a/test/log/5410 b/test/log/5410
index ba90ed7..efcee1b 100644
--- a/test/log/5410
+++ b/test/log/5410
@@ -9,3 +9,8 @@
1999-03-02 09:44:33 10HmbA-0005vi-00 >> usery@??? R=all T=smtp H=127.0.0.1 [127.0.0.1] C="250 OK id=10HmaZ-0005vi-00"
1999-03-02 09:44:33 10HmbA-0005vi-00 <= CALLER@??? U=CALLER P=local-esmtp S=sss
1999-03-02 09:44:33 10HmbA-0005vi-00 Completed
+1999-03-02 09:44:33 10HmbB-0005vi-00 <= CALLER@??? H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtp S=sss id=E10HmbC-0005vi-00@???
+1999-03-02 09:44:33 10HmbB-0005vi-00 no immediate delivery: queued by ACL
+1999-03-02 09:44:33 10HmbC-0005vi-00 >> usery@??? R=all T=smtp H=127.0.0.1 [127.0.0.1] C="250 OK id=10HmbB-0005vi-00"
+1999-03-02 09:44:33 10HmbC-0005vi-00 <= CALLER@??? U=CALLER P=local-esmtp S=sss
+1999-03-02 09:44:33 10HmbC-0005vi-00 Completed
diff --git a/test/log/5420 b/test/log/5420
index e859162..5dcefb3 100644
--- a/test/log/5420
+++ b/test/log/5420
@@ -9,3 +9,8 @@
1999-03-02 09:44:33 10HmbA-0005vi-00 >> usery@??? R=all T=smtp H=127.0.0.1 [127.0.0.1] C="250 OK id=10HmaZ-0005vi-00"
1999-03-02 09:44:33 10HmbA-0005vi-00 <= CALLER@??? U=CALLER P=local-esmtp S=sss
1999-03-02 09:44:33 10HmbA-0005vi-00 Completed
+1999-03-02 09:44:33 10HmbB-0005vi-00 <= CALLER@??? H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtp S=sss id=E10HmbC-0005vi-00@???
+1999-03-02 09:44:33 10HmbB-0005vi-00 no immediate delivery: queued by ACL
+1999-03-02 09:44:33 10HmbC-0005vi-00 >> usery@??? R=all T=smtp H=127.0.0.1 [127.0.0.1] C="250 OK id=10HmbB-0005vi-00"
+1999-03-02 09:44:33 10HmbC-0005vi-00 <= CALLER@??? U=CALLER P=local-esmtp S=sss
+1999-03-02 09:44:33 10HmbC-0005vi-00 Completed
diff --git a/test/scripts/5410-cutthrough-OpenSSL/5410 b/test/scripts/5410-cutthrough-OpenSSL/5410
index d670abf..9938e00 100644
--- a/test/scripts/5410-cutthrough-OpenSSL/5410
+++ b/test/scripts/5410-cutthrough-OpenSSL/5410
@@ -1,6 +1,7 @@
# cutthrough_delivery to target oferring TLS
exim -DSERVER=server -bd -oX PORT_D
****
+# this one should succeed
exim -d-all+acl+transport+expand+lists -bs
EHLO myhost.test.ex
MAIL FROM:<eximtest@???>
@@ -10,7 +11,19 @@ DATA
.
QUIT
****
-# via a transport setting never-tls
+# via a transport setting hosts_avoid_tls
+# so this one should not use TLS
+exim -d-all+acl+transport+expand+lists -bs
+EHLO myhost.test.ex
+MAIL FROM:<eximtest@???>
+RCPT TO:<usery@???>
+DATA
+
+.
+QUIT
+****
+# via a transport setting hosts_verify_avoid_tls
+# so this one should not use TLS
exim -d-all+acl+transport+expand+lists -bs
EHLO myhost.test.ex
MAIL FROM:<eximtest@???>
diff --git a/test/scripts/5420-cutthrough-GnuTLS/5420 b/test/scripts/5420-cutthrough-GnuTLS/5420
index d670abf..c43e186 100644
--- a/test/scripts/5420-cutthrough-GnuTLS/5420
+++ b/test/scripts/5420-cutthrough-GnuTLS/5420
@@ -1,4 +1,4 @@
-# cutthrough_delivery to target oferring TLS
+# cutthrough_delivery to target offering TLS
exim -DSERVER=server -bd -oX PORT_D
****
exim -d-all+acl+transport+expand+lists -bs
@@ -10,7 +10,17 @@ DATA
.
QUIT
****
-# via a transport setting never-tls
+# via a transport setting hosts_avoid_tls
+exim -d-all+acl+transport+expand+lists -bs
+EHLO myhost.test.ex
+MAIL FROM:<eximtest@???>
+RCPT TO:<usery@???>
+DATA
+
+.
+QUIT
+****
+# via a transport setting hosts_verify_avoid_tls
exim -d-all+acl+transport+expand+lists -bs
EHLO myhost.test.ex
MAIL FROM:<eximtest@???>
diff --git a/test/stderr/5410 b/test/stderr/5410
index 7babe35..f8b31a7 100644
--- a/test/stderr/5410
+++ b/test/stderr/5410
@@ -64,6 +64,20 @@ expanding: :
expanding: ${if eq {$address_data}{usery}{*}{:}}
result: :
127.0.0.1 in hosts_avoid_tls? no (end of list)
+expanding: $address_data
+ result: userx
+expanding: userz
+ result: userz
+condition: eq {$address_data}{userz}
+ result: false
+expanding: *
+ result: *
+skipping: result is not used
+expanding: :
+ result: :
+expanding: ${if eq {$address_data}{userz}{*}{:}}
+ result: :
+127.0.0.1 in hosts_verify_avoid_tls? no (end of list)
SMTP>> STARTTLS
SMTP<< 220 TLS go ahead
SMTP>> EHLO myhost.test.ex
@@ -270,5 +284,137 @@ LOG: MAIN
LOG: smtp_connection MAIN
SMTP connection from CALLER closed by QUIT
>>>>>>>>>>>>>>>> Exim pid=pppp terminating with rc=0 >>>>>>>>>>>>>>>>
+Exim version x.yz ....
+configuration file is TESTSUITE/test-config
+admin user
+ in hosts_connection_nolog? no (option unset)
+LOG: smtp_connection MAIN
+ SMTP connection from CALLER
+expanding: $smtp_active_hostname ESMTP Exim $version_number $tod_full
+ result: myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000
+ in pipelining_advertise_hosts? yes (matched "*")
+ in tls_advertise_hosts? yes (matched "*")
+expanding: SERVER
+ result: SERVER
+expanding: server
+ result: server
+condition: eq {SERVER}{server}
+ result: false
+expanding: queue
+ result: queue
+skipping: result is not used
+expanding: cutthrough
+ result: cutthrough
+expanding: ${if eq {SERVER}{server}{queue}{cutthrough}}
+ result: cutthrough
+using ACL "cutthrough"
+processing "accept"
+check control = cutthrough_delivery
+check verify = recipient
+domain.com in "test.ex : *.test.ex"? no (end of list)
+domain.com in "! +local_domains"? yes (end of list)
+expanding: $local_part
+ result: usery
+domain.com in "*"? yes (matched "*")
+----------- end verify ------------
+accept: condition test succeeded in ACL "cutthrough"
+----------- start cutthrough setup ------------
+domain.com in "test.ex : *.test.ex"? no (end of list)
+domain.com in "! +local_domains"? yes (end of list)
+expanding: $local_part
+ result: usery
+domain.com in "*"? yes (matched "*")
+Connecting to 127.0.0.1 [127.0.0.1]:1225 from ip4.ip4.ip4.ip4 ... connected
+expanding: $primary_hostname
+ result: myhost.test.ex
+ SMTP<< 220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000
+127.0.0.1 in hosts_avoid_esmtp? 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
+ 250-8BITMIME
+ 250-PIPELINING
+ 250-STARTTLS
+ 250 HELP
+expanding: $address_data
+ result: usery
+expanding: usery
+ result: usery
+condition: eq {$address_data}{usery}
+ result: true
+expanding: *
+ result: *
+expanding: :
+ result: :
+skipping: result is not used
+expanding: ${if eq {$address_data}{usery}{*}{:}}
+ result: *
+127.0.0.1 in hosts_avoid_tls? yes (matched "*")
+ SMTP>> MAIL FROM:<CALLER@???>
+ SMTP<< 250 OK
+ SMTP>> RCPT TO:<usery@???>
+ SMTP<< 250 Accepted
+----------- end cutthrough setup ------------
+processing "accept"
+accept: condition test succeeded in inline ACL
+ SMTP>> DATA
+ SMTP<< 354 Enter message, ending with "." on a line by itself
+expanding: ${tod_full}
+ result: Tue, 2 Mar 1999 09:44:33 +0000
+condition: def:sender_rcvhost
+ result: false
+expanding: from $sender_rcvhost
+
+ result: from
+
+skipping: result is not used
+condition: def:sender_ident
+ result: true
+expanding: $sender_ident
+ result: CALLER
+expanding: from ${quote_local_part:$sender_ident}
+ result: from CALLER
+condition: def:sender_helo_name
+ result: true
+expanding: (helo=$sender_helo_name)
+
+ result: (helo=myhost.test.ex)
+
+expanding: ${if def:sender_ident {from ${quote_local_part:$sender_ident} }}${if def:sender_helo_name {(helo=$sender_helo_name)
+ }}
+ result: from CALLER (helo=myhost.test.ex)
+
+condition: def:received_protocol
+ result: true
+expanding: with $received_protocol
+ result: with local-esmtp
+condition: def:sender_address
+ result: true
+expanding: (envelope-from <$sender_address>)
+
+ result: (envelope-from <CALLER@???>)
+
+condition: def:received_for
+ result: true
+expanding:
+ for $received_for
+ result:
+ for usery@???
+PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+expanding: ${tod_full}
+ result: Tue, 2 Mar 1999 09:44:33 +0000
+ SMTP>> .
+ SMTP<< 250 OK id=10HmbB-0005vi-00
+LOG: MAIN
+ >> usery@??? R=all T=smtp H=127.0.0.1 [127.0.0.1] C="250 OK id=10HmbB-0005vi-00"
+ SMTP>> QUIT
+----------- cutthrough shutdown (delivered) ------------
+LOG: MAIN
+ <= CALLER@??? U=CALLER P=local-esmtp S=sss
+LOG: MAIN
+ Completed
+LOG: smtp_connection MAIN
+ SMTP connection from CALLER closed by QUIT
+>>>>>>>>>>>>>>>> Exim pid=pppp terminating with rc=0 >>>>>>>>>>>>>>>>
******** SERVER ********
diff --git a/test/stderr/5420 b/test/stderr/5420
index 9059228..e711184 100644
--- a/test/stderr/5420
+++ b/test/stderr/5420
@@ -64,6 +64,20 @@ expanding: :
expanding: ${if eq {$address_data}{usery}{*}{:}}
result: :
127.0.0.1 in hosts_avoid_tls? no (end of list)
+expanding: $address_data
+ result: userx
+expanding: userz
+ result: userz
+condition: eq {$address_data}{userz}
+ result: false
+expanding: *
+ result: *
+skipping: result is not used
+expanding: :
+ result: :
+expanding: ${if eq {$address_data}{userz}{*}{:}}
+ result: :
+127.0.0.1 in hosts_verify_avoid_tls? no (end of list)
SMTP>> STARTTLS
SMTP<< 220 TLS go ahead
SMTP>> EHLO myhost.test.ex
@@ -270,5 +284,137 @@ LOG: MAIN
LOG: smtp_connection MAIN
SMTP connection from CALLER closed by QUIT
>>>>>>>>>>>>>>>> Exim pid=pppp terminating with rc=0 >>>>>>>>>>>>>>>>
+Exim version x.yz ....
+configuration file is TESTSUITE/test-config
+admin user
+ in hosts_connection_nolog? no (option unset)
+LOG: smtp_connection MAIN
+ SMTP connection from CALLER
+expanding: $smtp_active_hostname ESMTP Exim $version_number $tod_full
+ result: myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000
+ in pipelining_advertise_hosts? yes (matched "*")
+ in tls_advertise_hosts? yes (matched "*")
+expanding: SERVER
+ result: SERVER
+expanding: server
+ result: server
+condition: eq {SERVER}{server}
+ result: false
+expanding: queue
+ result: queue
+skipping: result is not used
+expanding: cutthrough
+ result: cutthrough
+expanding: ${if eq {SERVER}{server}{queue}{cutthrough}}
+ result: cutthrough
+using ACL "cutthrough"
+processing "accept"
+check control = cutthrough_delivery
+check verify = recipient
+domain.com in "test.ex : *.test.ex"? no (end of list)
+domain.com in "! +local_domains"? yes (end of list)
+expanding: $local_part
+ result: usery
+domain.com in "*"? yes (matched "*")
+----------- end verify ------------
+accept: condition test succeeded in ACL "cutthrough"
+----------- start cutthrough setup ------------
+domain.com in "test.ex : *.test.ex"? no (end of list)
+domain.com in "! +local_domains"? yes (end of list)
+expanding: $local_part
+ result: usery
+domain.com in "*"? yes (matched "*")
+Connecting to 127.0.0.1 [127.0.0.1]:1225 from ip4.ip4.ip4.ip4 ... connected
+expanding: $primary_hostname
+ result: myhost.test.ex
+ SMTP<< 220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000
+127.0.0.1 in hosts_avoid_esmtp? 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
+ 250-8BITMIME
+ 250-PIPELINING
+ 250-STARTTLS
+ 250 HELP
+expanding: $address_data
+ result: usery
+expanding: usery
+ result: usery
+condition: eq {$address_data}{usery}
+ result: true
+expanding: *
+ result: *
+expanding: :
+ result: :
+skipping: result is not used
+expanding: ${if eq {$address_data}{usery}{*}{:}}
+ result: *
+127.0.0.1 in hosts_avoid_tls? yes (matched "*")
+ SMTP>> MAIL FROM:<CALLER@???>
+ SMTP<< 250 OK
+ SMTP>> RCPT TO:<usery@???>
+ SMTP<< 250 Accepted
+----------- end cutthrough setup ------------
+processing "accept"
+accept: condition test succeeded in inline ACL
+ SMTP>> DATA
+ SMTP<< 354 Enter message, ending with "." on a line by itself
+expanding: ${tod_full}
+ result: Tue, 2 Mar 1999 09:44:33 +0000
+condition: def:sender_rcvhost
+ result: false
+expanding: from $sender_rcvhost
+
+ result: from
+
+skipping: result is not used
+condition: def:sender_ident
+ result: true
+expanding: $sender_ident
+ result: CALLER
+expanding: from ${quote_local_part:$sender_ident}
+ result: from CALLER
+condition: def:sender_helo_name
+ result: true
+expanding: (helo=$sender_helo_name)
+
+ result: (helo=myhost.test.ex)
+
+expanding: ${if def:sender_ident {from ${quote_local_part:$sender_ident} }}${if def:sender_helo_name {(helo=$sender_helo_name)
+ }}
+ result: from CALLER (helo=myhost.test.ex)
+
+condition: def:received_protocol
+ result: true
+expanding: with $received_protocol
+ result: with local-esmtp
+condition: def:sender_address
+ result: true
+expanding: (envelope-from <$sender_address>)
+
+ result: (envelope-from <CALLER@???>)
+
+condition: def:received_for
+ result: true
+expanding:
+ for $received_for
+ result:
+ for usery@???
+PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+expanding: ${tod_full}
+ result: Tue, 2 Mar 1999 09:44:33 +0000
+ SMTP>> .
+ SMTP<< 250 OK id=10HmbB-0005vi-00
+LOG: MAIN
+ >> usery@??? R=all T=smtp H=127.0.0.1 [127.0.0.1] C="250 OK id=10HmbB-0005vi-00"
+ SMTP>> QUIT
+----------- cutthrough shutdown (delivered) ------------
+LOG: MAIN
+ <= CALLER@??? U=CALLER P=local-esmtp S=sss
+LOG: MAIN
+ Completed
+LOG: smtp_connection MAIN
+ SMTP connection from CALLER closed by QUIT
+>>>>>>>>>>>>>>>> Exim pid=pppp terminating with rc=0 >>>>>>>>>>>>>>>>
******** SERVER ********
diff --git a/test/stdout/5410 b/test/stdout/5410
index 252c829..edf01f8 100644
--- a/test/stdout/5410
+++ b/test/stdout/5410
@@ -22,3 +22,15 @@
354 Enter message, ending with "." on a line by itself
250 OK id=10HmbA-0005vi-00
221 myhost.test.ex closing connection
+220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000
+250-myhost.test.ex Hello CALLER at myhost.test.ex
+250-SIZE 52428800
+250-8BITMIME
+250-PIPELINING
+250-STARTTLS
+250 HELP
+250 OK
+250 Accepted
+354 Enter message, ending with "." on a line by itself
+250 OK id=10HmbC-0005vi-00
+221 myhost.test.ex closing connection
diff --git a/test/stdout/5420 b/test/stdout/5420
index 252c829..edf01f8 100644
--- a/test/stdout/5420
+++ b/test/stdout/5420
@@ -22,3 +22,15 @@
354 Enter message, ending with "." on a line by itself
250 OK id=10HmbA-0005vi-00
221 myhost.test.ex closing connection
+220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000
+250-myhost.test.ex Hello CALLER at myhost.test.ex
+250-SIZE 52428800
+250-8BITMIME
+250-PIPELINING
+250-STARTTLS
+250 HELP
+250 OK
+250 Accepted
+354 Enter message, ending with "." on a line by itself
+250 OK id=10HmbC-0005vi-00
+221 myhost.test.ex closing connection
