I may find the root cause - comparing the output between google's mail
server and my mail server
my mail server
ts=2022-07-05T02:29:41.608566903Z caller=main.go:130 module=smtp_starttls
target=1.1.1.1:25 level=info msg="Successfully dialed"
ts=2022-07-05T02:29:41.608652361Z caller=main.go:130 module=smtp_starttls
target=1.1.1.1:25 level=info msg="Processing query response entry"
entry_number=0
ts=2022-07-05T02:29:41.609572861Z caller=main.go:130 module=smtp_starttls
target=1.1.1.1:25 level=debug msg="Read line" line="220 mail.com ESMTP"
ts=2022-07-05T02:29:46.607798497Z caller=main.go:130 module=smtp_starttls
target=11.1.1.1:25 level=error msg="Error reading from connection"
err="read tcp4 0.0.0.0:57074->1.1.1.1:25: i/o timeout"
google's mail server
ts=2022-07-05T02:04:33.385587664Z caller=main.go:130 module=smtp_starttls
target=142.250.102.27:25 level=info msg="Successfully dialed"
ts=2022-07-05T02:04:33.385613189Z caller=main.go:130 module=smtp_starttls
target=142.250.102.27:25 level=info msg="Processing query response entry"
entry_number=0
ts=2022-07-05T02:04:33.419235886Z caller=main.go:130 module=smtp_starttls
target=142.250.102.27:25 level=debug msg="Read line" line="220
mx.google.com ESMTP dn22-20020a17090794d600b006dfc3945326si6666807ejc.152 -
gsmtp"
ts=2022-07-05T02:04:33.419280493Z caller=main.go:130 module=smtp_starttls
target=142.250.102.27:25 level=info msg="Regexp matched" regexp="^220 ([^
]+) ESMTP (.+)$" line="220 mx.google.com ESMTP
dn22-20020a17090794d600b006dfc3945326si6666807ejc.152 - gsmtp"
>From the output it shows the regex is not matched for my mail server - ^220
([^ ]+) ESMTP (.+)$
In config file
smtp_starttls:
prober: tcp
timeout: 20s
tcp:
query_response:
- expect: "^220 ([^ ]+) ESMTP (.+)$"
send: "EHLO prober\r"
- expect: "^250-STARTTLS"
- expect: "^250 .*$"
send: "STARTTLS\r"
- expect: "^220"
starttls: true
- send: "EHLO prober\r"
- expect: "^250 .*$"
send: "QUIT\r"
On Tuesday, July 5, 2022 at 11:40:06 AM UTC+8 nina guo wrote:
> I searched this info blackbox_exporter for SMTP monitoring w/ TCP module
> : PrometheusMonitoring (reddit.com)
> <https://www.reddit.com/r/PrometheusMonitoring/comments/q60357/blackbox_exporter_for_smtp_monitoring_w_tcp_module/>
> ,
> added "\r", but still got the same issue..
>
> On Tuesday, July 5, 2022 at 11:26:49 AM UTC+8 nina guo wrote:
>
>> telnet got succeed.
>>
>> telnet 1.1.1.1 25
>> Trying 1.1.1.1...
>> Connected to 1.1.1.1.
>> Escape character is '^]'.
>> 220 ... ESMTP
>>
>> On Tuesday, July 5, 2022 at 11:11:48 AM UTC+8 nina guo wrote:
>>
>>> Probe failed due to TLS issue...it is not the same issue with my mail
>>> server..
>>> There is no "i/o timeout" issue for google's mail server.
>>>
>>> curl -g '
>>> http://0.0.0.0:9115/probe?module=smtp_starttls&target=142.250.102.27:25&debug=true
>>>
>>> <http://100.100.3.9:9115/probe?module=smtp_starttls&target=142.250.102.27:25&debug=true>
>>> '
>>> Logs for the probe:
>>> ts=2022-07-05T02:04:33.373763474Z caller=main.go:320
>>> module=smtp_starttls target=142.250.102.27:25 level=info msg="Beginning
>>> probe" probe=tcp timeout_seconds=5
>>> ts=2022-07-05T02:04:33.373850167Z caller=tcp.go:40 module=smtp_starttls
>>> target=142.250.102.27:25 level=info msg="Resolving target address"
>>> ip_protocol=ip6
>>> ts=2022-07-05T02:04:33.373867876Z caller=tcp.go:40 module=smtp_starttls
>>> target=142.250.102.27:25 level=info msg="Resolving target address"
>>> ip_protocol=ip4
>>> ts=2022-07-05T02:04:33.373882263Z caller=tcp.go:40 module=smtp_starttls
>>> target=142.250.102.27:25 level=info msg="Resolved target address"
>>> ip=142.250.102.27
>>> ts=2022-07-05T02:04:33.373903614Z caller=tcp.go:121 module=smtp_starttls
>>> target=142.250.102.27:25 level=info msg="Dialing TCP without TLS"
>>> ts=2022-07-05T02:04:33.385587664Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>> msg="Successfully dialed"
>>> ts=2022-07-05T02:04:33.385613189Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>> msg="Processing query response entry" entry_number=0
>>> ts=2022-07-05T02:04:33.419235886Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>> line" line="220 mx.google.com ESMTP
>>> dn22-20020a17090794d600b006dfc3945326si6666807ejc.152 - gsmtp"
>>> ts=2022-07-05T02:04:33.419280493Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=info msg="Regexp
>>> matched" regexp="^220 ([^ ]+) ESMTP (.+)$" line="220 mx.google.com ESMTP
>>> dn22-20020a17090794d600b006dfc3945326si6666807ejc.152 - gsmtp"
>>> ts=2022-07-05T02:04:33.419310506Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Sending
>>> line" line="EHLO prober"
>>> ts=2022-07-05T02:04:33.419356415Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>> msg="Processing query response entry" entry_number=1
>>> ts=2022-07-05T02:04:33.43519464Z caller=main.go:130 module=smtp_starttls
>>> target=142.250.102.27:25 level=debug msg="Read line" line="
>>> 250-mx.google.com at your service, [130.214.226.41]"
>>> ts=2022-07-05T02:04:33.435229899Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>> line" line="250-SIZE 157286400"
>>> ts=2022-07-05T02:04:33.435242182Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>> line" line=250-8BITMIME
>>> ts=2022-07-05T02:04:33.435254457Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>> line" line=250-STARTTLS
>>> ts=2022-07-05T02:04:33.435270364Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=info msg="Regexp
>>> matched" regexp=^250-STARTTLS line=250-STARTTLS
>>> ts=2022-07-05T02:04:33.435285968Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>> msg="Processing query response entry" entry_number=2
>>> ts=2022-07-05T02:04:33.435310813Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>> line" line=250-ENHANCEDSTATUSCODES
>>> ts=2022-07-05T02:04:33.435323258Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>> line" line=250-PIPELINING
>>> ts=2022-07-05T02:04:33.435337373Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>> line" line=250-CHUNKING
>>> ts=2022-07-05T02:04:33.435373931Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>> line" line="250 SMTPUTF8"
>>> ts=2022-07-05T02:04:33.435392537Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=info msg="Regexp
>>> matched" regexp="^250 .*$" line="250 SMTPUTF8"
>>> ts=2022-07-05T02:04:33.435409638Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Sending
>>> line" line=STARTTLS
>>> ts=2022-07-05T02:04:33.435451742Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>> msg="Processing query response entry" entry_number=3
>>> ts=2022-07-05T02:04:33.449015201Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>> line" line="220 2.0.0 Ready to start TLS"
>>> ts=2022-07-05T02:04:33.449039996Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=info msg="Regexp
>>> matched" regexp=^220 line="220 2.0.0 Ready to start TLS"
>>> ts=2022-07-05T02:04:33.476697731Z caller=main.go:130
>>> module=smtp_starttls target=142.250.102.27:25 level=error msg="TLS
>>> Handshake (client) failed" err="x509: cannot validate certificate for
>>> 142.250.102.27 because it doesn't contain any IP SANs"
>>> ts=2022-07-05T02:04:33.47676603Z caller=main.go:320 module=smtp_starttls
>>> target=142.250.102.27:25 level=error msg="Probe failed"
>>> duration_seconds=0.102953678
>>>
>>>
>>>
>>>
>>> Metrics that would have been returned:
>>> # HELP probe_dns_lookup_time_seconds Returns the time taken for probe
>>> dns lookup in seconds
>>> # TYPE probe_dns_lookup_time_seconds gauge
>>> probe_dns_lookup_time_seconds 5.1452e-05
>>>
>>> # HELP probe_duration_seconds Returns how long the probe took to
>>> complete in seconds
>>> # TYPE probe_duration_seconds gauge
>>> probe_duration_seconds 0.102953678
>>>
>>> # HELP probe_failed_due_to_regex Indicates if probe failed due to regex
>>> # TYPE probe_failed_due_to_regex gauge
>>> probe_failed_due_to_regex 0
>>> # HELP probe_ip_addr_hash Specifies the hash of IP address. It's useful
>>> to detect if the IP address changes.
>>> # TYPE probe_ip_addr_hash gauge
>>> probe_ip_addr_hash 9.60720384e+08
>>> # HELP probe_ip_protocol Specifies whether probe ip protocol is IP4 or
>>> IP6
>>> # TYPE probe_ip_protocol gauge
>>> probe_ip_protocol 4
>>> # HELP probe_success Displays whether or not the probe was a success
>>> # TYPE probe_success gauge
>>> probe_success 0
>>>
>>> Module configuration:
>>> prober: tcp
>>> timeout: 5s
>>> http:
>>> ip_protocol_fallback: true
>>> follow_redirects: true
>>> tcp:
>>> ip_protocol_fallback: true
>>> query_response:
>>> - expect: ^220 ([^ ]+) ESMTP (.+)$
>>> send: EHLO prober
>>> - expect: ^250-STARTTLS
>>> - expect: ^250 .*$
>>> send: STARTTLS
>>> - expect: ^220
>>> starttls: true
>>> - send: EHLO prober
>>> - expect: ^250 .*$
>>> send: QUIT
>>> icmp:
>>> ip_protocol_fallback: true
>>> dns:
>>> ip_protocol_fallback: true
>>>
>>>
>>> On Monday, July 4, 2022 at 8:44:49 PM UTC+8 Brian Candler wrote:
>>>
>>>> And if you try it with Google's mail server?
>>>> *curl -g
>>>> 'localhost:9115/probe?module=smtp_starttls&target=aspmx.l.google.com:25&debug=true'*
>>>>
>>>> On Monday, 4 July 2022 at 12:50:47 UTC+1 [email protected] wrote:
>>>>
>>>>> Still received the same error msg:
>>>>>
>>>>> curl -g '
>>>>> http://0.0.0.0:9115/probe?module=smtp_starttls&target=1.1.1.1:25&debug=true
>>>>> '
>>>>> Logs for the probe:
>>>>> ts=2022-07-04T11:47:59.071097704Z caller=main.go:320
>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=info msg="Beginning
>>>>> probe"
>>>>> probe=tcp timeout_seconds=5
>>>>> ts=2022-07-04T11:47:59.071251831Z caller=tcp.go:40
>>>>> module=smtp_starttls target=1 1.1.1.1 :25 level=info msg="Resolving
>>>>> target
>>>>> address" ip_protocol=ip6
>>>>> ts=2022-07-04T11:47:59.071292289Z caller=tcp.go:40
>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=info msg="Resolving
>>>>> target
>>>>> address" ip_protocol=ip4
>>>>> ts=2022-07-04T11:47:59.071327224Z caller=tcp.go:40
>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=info msg="Resolved target
>>>>> address" ip= 1.1.1.1
>>>>> ts=2022-07-04T11:47:59.071354819Z caller=tcp.go:121
>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=info msg="Dialing TCP
>>>>> without TLS"
>>>>> ts=2022-07-04T11:47:59.072469713Z caller=main.go:130
>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=info msg="Successfully
>>>>> dialed"
>>>>> ts=2022-07-04T11:47:59.072508076Z caller=main.go:130
>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=info msg="Processing
>>>>> query
>>>>> response entry" entry_number=0
>>>>> ts=2022-07-04T11:47:59.073453639Z caller=main.go:130
>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=debug msg="Read line"
>>>>> line="220 ESMTP"
>>>>> ts=2022-07-04T11:48:04.072081695Z caller=main.go:130
>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=error msg="Error reading
>>>>> from connection" err="read tcp4 0.0.0.0:53872->1.1.1.1:25: i/o
>>>>> timeout"
>>>>> ts=2022-07-04T11:48:04.072269643Z caller=main.go:320
>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=error msg="Probe failed"
>>>>> duration_seconds=5.00106792
>>>>>
>>>>>
>>>>>
>>>>> Metrics that would have been returned:
>>>>> # HELP probe_dns_lookup_time_seconds Returns the time taken for probe
>>>>> dns lookup in seconds
>>>>> # TYPE probe_dns_lookup_time_seconds gauge
>>>>> probe_dns_lookup_time_seconds 0.000101683
>>>>> # HELP probe_duration_seconds Returns how long the probe took to
>>>>> complete in seconds
>>>>> # TYPE probe_duration_seconds gauge
>>>>> probe_duration_seconds 5.00106792
>>>>> # HELP probe_failed_due_to_regex Indicates if probe failed due to regex
>>>>> # TYPE probe_failed_due_to_regex gauge
>>>>> probe_failed_due_to_regex 0
>>>>> # HELP probe_ip_addr_hash Specifies the hash of IP address. It's
>>>>> useful to detect if the IP address changes.
>>>>> # TYPE probe_ip_addr_hash gauge
>>>>> probe_ip_addr_hash 2.493392506e+09
>>>>> # HELP probe_ip_protocol Specifies whether probe ip protocol is IP4 or
>>>>> IP6
>>>>> # TYPE probe_ip_protocol gauge
>>>>> probe_ip_protocol 4
>>>>> # HELP probe_success Displays whether or not the probe was a success
>>>>> # TYPE probe_success gauge
>>>>> probe_success 0
>>>>>
>>>>>
>>>>>
>>>>> Module configuration:
>>>>> prober: tcp
>>>>> timeout: 5s
>>>>> http:
>>>>> ip_protocol_fallback: true
>>>>> follow_redirects: true
>>>>> tcp:
>>>>> ip_protocol_fallback: true
>>>>> query_response:
>>>>> - expect: ^220 ([^ ]+) ESMTP (.+)$
>>>>> send: EHLO prober
>>>>> - expect: ^250-STARTTLS
>>>>> - expect: ^250 .*$
>>>>> send: STARTTLS
>>>>> - expect: ^220
>>>>> starttls: true
>>>>> - send: EHLO prober
>>>>> - expect: ^250 .*$
>>>>> send: QUIT
>>>>> icmp:
>>>>> ip_protocol_fallback: true
>>>>> dns:
>>>>> ip_protocol_fallback: true
>>>>>
>>>>> On Monday, July 4, 2022 at 7:22:08 PM UTC+8 Brian Candler wrote:
>>>>>
>>>>>> Could you first just try copy-pasting the working config I gave you,
>>>>>> and see if it gives a different result to yours?
>>>>>>
>>>>>> I doubt a mail server would take more than 5 seconds to give a
>>>>>> banner, but it's possible. Simply doing "telnet x.x.x.x 25" will show
>>>>>> you
>>>>>> how your mail server behaves.
>>>>>>
>>>>>> On Monday, 4 July 2022 at 11:14:23 UTC+1 [email protected] wrote:
>>>>>>
>>>>>>>
>>>>>>> Yes in my code the first expect is quoted.
>>>>>>>
>>>>>>> smtp_starttls:
>>>>>>> prober: tcp
>>>>>>> timeout: 5s
>>>>>>> tcp:
>>>>>>> query_response:
>>>>>>> - expect: "^220 ([^ ]+) ESMTP (.+)$"
>>>>>>> - send: "EHLO prober\r"
>>>>>>> - expect: "^250-STARTTLS"
>>>>>>> - send: "STARTTLS\r"
>>>>>>> - expect: "^220"
>>>>>>> - starttls: true
>>>>>>> - send: "EHLO prober\r"
>>>>>>> - expect: "^250-AUTH"
>>>>>>> - send: "QUIT\r"
>>>>>>>
>>>>>>> Probably due to the "timeout" is too less? Should I adjust 5s to 15s
>>>>>>> or 60s?
>>>>>>> On Monday, July 4, 2022 at 5:55:09 PM UTC+8 Brian Candler wrote:
>>>>>>>
>>>>>>>> The following works for me with blackbox_exporter 0.21.0 (maybe
>>>>>>>> your first 'expect' regexp needs to be quoted?)
>>>>>>>>
>>>>>>>> modules:
>>>>>>>> smtp_starttls:
>>>>>>>> prober: tcp
>>>>>>>> timeout: 5s
>>>>>>>> tcp:
>>>>>>>> query_response:
>>>>>>>> - expect: "^220 ([^ ]+) ESMTP (.+)$"
>>>>>>>> send: "EHLO prober"
>>>>>>>> - expect: "^250-STARTTLS"
>>>>>>>> - expect: "^250 .*$"
>>>>>>>> send: "STARTTLS"
>>>>>>>> - expect: "^220"
>>>>>>>>
>>>>>>>> starttls: true
>>>>>>>> - send: "EHLO prober"
>>>>>>>> - expect: "^250 .*$"
>>>>>>>> send: "QUIT"
>>>>>>>>
>>>>>>>> Result:
>>>>>>>>
>>>>>>>> # *curl -g
>>>>>>>> 'localhost:9115/probe?module=smtp_starttls&target=aspmx.l.google.com:25&debug=true'*
>>>>>>>> Logs for the probe:
>>>>>>>> ts=2022-07-04T09:50:46.764604425Z caller=main.go:351
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Beginning probe" probe=tcp timeout_seconds=5
>>>>>>>> ts=2022-07-04T09:50:46.764875668Z caller=tcp.go:40
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Resolving target address" target=aspmx.l.google.com
>>>>>>>> ip_protocol=ip6
>>>>>>>> ts=2022-07-04T09:50:46.765954096Z caller=tcp.go:40
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Resolved target address" target=aspmx.l.google.com
>>>>>>>> ip=2a00:1450:400c:c07::1b
>>>>>>>> ts=2022-07-04T09:50:46.766011111Z caller=tcp.go:121
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Dialing TCP without TLS"
>>>>>>>> ts=2022-07-04T09:50:46.776962616Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Successfully dialed"
>>>>>>>> ts=2022-07-04T09:50:46.77708032Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Processing query response entry" entry_number=0
>>>>>>>> ts=2022-07-04T09:50:46.788075017Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line="220 mx.google.com ESMTP
>>>>>>>> u1-20020a056000038100b0021bbcef3a69si36572085wrf.542 - gsmtp"
>>>>>>>> ts=2022-07-04T09:50:46.788168204Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Regexp matched" regexp="^220 ([^ ]+) ESMTP (.+)$" line="220
>>>>>>>> mx.google.com ESMTP
>>>>>>>> u1-20020a056000038100b0021bbcef3a69si36572085wrf.542 - gsmtp"
>>>>>>>> ts=2022-07-04T09:50:46.788223914Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Sending line" line="EHLO prober"
>>>>>>>> ts=2022-07-04T09:50:46.788362926Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Processing query response entry" entry_number=1
>>>>>>>> ts=2022-07-04T09:50:46.801755535Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line="250-mx.google.com at your service,
>>>>>>>> [xx:xx:xx:xx::33]"
>>>>>>>> ts=2022-07-04T09:50:46.801856147Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line="250-SIZE 157286400"
>>>>>>>> ts=2022-07-04T09:50:46.801889927Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line=250-8BITMIME
>>>>>>>> ts=2022-07-04T09:50:46.801922312Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line=250-STARTTLS
>>>>>>>> ts=2022-07-04T09:50:46.801955499Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Regexp matched" regexp=^250-STARTTLS line=250-STARTTLS
>>>>>>>> ts=2022-07-04T09:50:46.801989646Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Processing query response entry" entry_number=2
>>>>>>>> ts=2022-07-04T09:50:46.802029066Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line=250-ENHANCEDSTATUSCODES
>>>>>>>> ts=2022-07-04T09:50:46.802063318Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line=250-PIPELINING
>>>>>>>> ts=2022-07-04T09:50:46.802094713Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line=250-CHUNKING
>>>>>>>> ts=2022-07-04T09:50:46.802126198Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line="250 SMTPUTF8"
>>>>>>>> ts=2022-07-04T09:50:46.802159858Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Regexp matched" regexp="^250 .*$" line="250 SMTPUTF8"
>>>>>>>> ts=2022-07-04T09:50:46.802191065Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Sending line" line=STARTTLS
>>>>>>>> ts=2022-07-04T09:50:46.802271697Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Processing query response entry" entry_number=3
>>>>>>>> ts=2022-07-04T09:50:46.812211682Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line="220 2.0.0 Ready to start TLS"
>>>>>>>> ts=2022-07-04T09:50:46.812279339Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Regexp matched" regexp=^220 line="220 2.0.0 Ready to start TLS"
>>>>>>>> ts=2022-07-04T09:50:46.833573801Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="TLS Handshake (client) succeeded."
>>>>>>>> ts=2022-07-04T09:50:46.833793385Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Processing query response entry" entry_number=4
>>>>>>>> ts=2022-07-04T09:50:46.833838422Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Sending line" line="EHLO prober"
>>>>>>>> ts=2022-07-04T09:50:46.833960852Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Processing query response entry" entry_number=5
>>>>>>>> ts=2022-07-04T09:50:46.84464181Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line="250-mx.google.com at your service,
>>>>>>>> [xx:xx:xx:xx::33]"
>>>>>>>> ts=2022-07-04T09:50:46.844771942Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line="250-SIZE 157286400"
>>>>>>>> ts=2022-07-04T09:50:46.844839074Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line=250-8BITMIME
>>>>>>>> ts=2022-07-04T09:50:46.844910271Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line=250-ENHANCEDSTATUSCODES
>>>>>>>> ts=2022-07-04T09:50:46.844974538Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line=250-PIPELINING
>>>>>>>> ts=2022-07-04T09:50:46.845061058Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line=250-CHUNKING
>>>>>>>> ts=2022-07-04T09:50:46.84512579Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Read line" line="250 SMTPUTF8"
>>>>>>>> ts=2022-07-04T09:50:46.845193403Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Regexp matched" regexp="^250 .*$" line="250 SMTPUTF8"
>>>>>>>> ts=2022-07-04T09:50:46.84525809Z caller=main.go:144
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>> msg="Sending line" line=QUIT
>>>>>>>> ts=2022-07-04T09:50:46.845583228Z caller=main.go:351
>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>> msg="Probe succeeded" duration_seconds=0.080912196
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Metrics that would have been returned:
>>>>>>>> # HELP probe_dns_lookup_time_seconds Returns the time taken for
>>>>>>>> probe dns lookup in seconds
>>>>>>>> # TYPE probe_dns_lookup_time_seconds gauge
>>>>>>>> probe_dns_lookup_time_seconds 0.001103057
>>>>>>>>
>>>>>>>> # HELP probe_duration_seconds Returns how long the probe took to
>>>>>>>> complete in seconds
>>>>>>>> # TYPE probe_duration_seconds gauge
>>>>>>>> probe_duration_seconds 0.080912196
>>>>>>>>
>>>>>>>> # HELP probe_failed_due_to_regex Indicates if probe failed due to
>>>>>>>> regex
>>>>>>>> # TYPE probe_failed_due_to_regex gauge
>>>>>>>> probe_failed_due_to_regex 0
>>>>>>>> # HELP probe_ip_addr_hash Specifies the hash of IP address. It's
>>>>>>>> useful to detect if the IP address changes.
>>>>>>>> # TYPE probe_ip_addr_hash gauge
>>>>>>>> probe_ip_addr_hash 2.766777767e+09
>>>>>>>>
>>>>>>>> # HELP probe_ip_protocol Specifies whether probe ip protocol is IP4
>>>>>>>> or IP6
>>>>>>>> # TYPE probe_ip_protocol gauge
>>>>>>>> probe_ip_protocol 6
>>>>>>>> # HELP probe_ssl_earliest_cert_expiry Returns earliest SSL cert
>>>>>>>> expiry date
>>>>>>>> # TYPE probe_ssl_earliest_cert_expiry gauge
>>>>>>>> probe_ssl_earliest_cert_expiry 1.661764429e+09
>>>>>>>> # HELP probe_ssl_last_chain_expiry_timestamp_seconds Returns last
>>>>>>>> SSL chain expiry in unixtime
>>>>>>>> # TYPE probe_ssl_last_chain_expiry_timestamp_seconds gauge
>>>>>>>> probe_ssl_last_chain_expiry_timestamp_seconds 1.661764429e+09
>>>>>>>>
>>>>>>>> # HELP probe_success Displays whether or not the probe was a success
>>>>>>>> # TYPE probe_success gauge
>>>>>>>> probe_success 1
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Module configuration:
>>>>>>>> prober: tcp
>>>>>>>> timeout: 5s
>>>>>>>> http:
>>>>>>>> ip_protocol_fallback: true
>>>>>>>> follow_redirects: true
>>>>>>>> enable_http2: true
>>>>>>>>
>>>>>>>> tcp:
>>>>>>>> ip_protocol_fallback: true
>>>>>>>> query_response:
>>>>>>>> - expect: ^220 ([^ ]+) ESMTP (.+)$
>>>>>>>> send: EHLO prober
>>>>>>>> - expect: ^250-STARTTLS
>>>>>>>> - expect: ^250 .*$
>>>>>>>> send: STARTTLS
>>>>>>>> - expect: ^220
>>>>>>>>
>>>>>>>> starttls: true
>>>>>>>> - send: EHLO prober
>>>>>>>> - expect: ^250 .*$
>>>>>>>> send: QUIT
>>>>>>>>
>>>>>>>> icmp:
>>>>>>>> ip_protocol_fallback: true
>>>>>>>> dns:
>>>>>>>> ip_protocol_fallback: true
>>>>>>>> recursion_desired: true
>>>>>>>>
>>>>>>>
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