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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