No - there is nothing after those lines on the sending system - so I would agree the issue likely is since no message was sent, the server disconnected.

I'll try increasing the message size and report back.
From: Martijn Brinkers <martijn@ciphermail.com>
Sent: June 10, 2020 1:01 PM
To: Sir Mac <bmaclenn@hotmail.com>; users@lists.ciphermail.com <users@lists.ciphermail.com>
Subject: Re: [CipherMail User] Re: EHLO Disconnect
 
It looks like a Java client that tries to send email.

Is that all the log/debug information from the Java client? I do not see
any line that the connection was terminated. My guess is that somehow
the Java client decides to terminate the connection.

Do you have more logging after the following line:

> DEBUG SMTP: Found extension "8BITMIME", arg ""

Could it be that the email you try to send is larger than 20240000
bytes?, i.e., the value reported by "250-SIZE 20240000"

Kind regards,

Martijn Brinkers

On 10-06-2020 14:42, Sir Mac wrote:
> Hi Martijn,
>
> Ciphermail is our SMTP server and is used with DLP to encrypt outgoing
> messages. The system is authorized to relay messages through this server.
> I place a debug line in postfix - this is the output. (I cleaned out
> some of the other match_hostaddr from the list)
>
> Jun 10 08:19:23 ems postfix/master[82504]: daemon started -- version
> 2.10.1, configuration /etc/postfix
> Jun 10 08:21:16 ems postfix/smtpd[82508]: connect from unknown[10.10.20.210]
> Jun 10 08:21:16 ems postfix/smtpd[82508]: smtp_stream_setup: maxtime=300
> enable_deadline=0
> Jun 10 08:21:16 ems postfix/smtpd[82508]: match_hostname: unknown ~?
> 127.0.0.0/8
> Jun 10 08:21:16 ems postfix/smtpd[82508]: match_hostaddr: 10.10.20.210
> ~? 127.0.0.0/8
> Jun 10 08:21:16 ems postfix/smtpd[82508]: match_hostname: unknown ~?
> [::1]/128
> Jun 10 08:21:16 ems postfix/smtpd[82508]: match_hostaddr: 10.10.20.210
> ~? [::1]/128
> Jun 10 08:21:16 ems postfix/smtpd[82508]: match_hostaddr: 10.10.20.210
> ~? 10.10.20.210
> Jun 10 08:21:16 ems postfix/smtpd[82508]: name_mask: silent-discard
> Jun 10 08:21:16 ems postfix/smtpd[82508]: name_mask: dsn
> Jun 10 08:21:16 ems postfix/smtpd[82508]: name_mask: etrn
> Jun 10 08:21:16 ems postfix/smtpd[82508]: > unknown[10.10.20.210]: 220
> ems.jc.ca ESMTP CipherMail
> Jun 10 08:21:16 ems postfix/smtpd[82508]: watchdog_pat: 0x556660d87140
> Jun 10 08:21:16 ems postfix/smtpd[82508]: < unknown[10.10.20.210]: EHLO
> d.jc.ca
> Jun 10 08:21:16 ems postfix/smtpd[82508]: match_list_match: unknown: no
> match
> Jun 10 08:21:16 ems postfix/smtpd[82508]: match_list_match:
> 10.10.20.210: no match
> Jun 10 08:21:16 ems postfix/smtpd[82508]: > unknown[10.10.20.210]:
> 250-ems.jc.ca
> Jun 10 08:21:16 ems postfix/smtpd[82508]: > unknown[10.10.20.210]:
> 250-PIPELINING
> Jun 10 08:21:16 ems postfix/smtpd[82508]: > unknown[10.10.20.210]:
> 250-SIZE 20240000
> Jun 10 08:21:16 ems postfix/smtpd[82508]: > unknown[10.10.20.210]: 250-VRFY
> Jun 10 08:21:16 ems postfix/smtpd[82508]: > unknown[10.10.20.210]:
> 250-ENHANCEDSTATUSCODES
> Jun 10 08:21:16 ems postfix/smtpd[82508]: > unknown[10.10.20.210]: 250
> 8BITMIME
> Jun 10 08:21:16 ems postfix/smtpd[82508]: watchdog_pat: 0x556660d87140
> Jun 10 08:21:17 ems postfix/smtpd[82508]: smtp_get: EOF
> Jun 10 08:21:17 ems postfix/smtpd[82508]: match_hostname: unknown ~?
> 10.10.20.210
> Jun 10 08:21:17 ems postfix/smtpd[82508]: match_hostaddr: 10.10.20.210
> ~? 10.10.20.210
> Jun 10 08:21:17 ems postfix/smtpd[82508]: lost connection after EHLO
> from unknown[10.10.20.210]
> Jun 10 08:21:17 ems postfix/smtpd[82508]: disconnect from
> unknown[10.10.20.210]
>
> From the system sending the message to Ciphermail (ems.jc.ca)
>
> DEBUG: getProvider() returning
> javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
> DEBUG SMTP: useEhlo true, useAuth false
> DEBUG SMTP: trying to connect to host "ems.jc.ca", port 25, isSSL false
> 220 ems.jc.ca ESMTP CipherMail
> DEBUG SMTP: connected to host "ems.jc.ca", port: 25
>
> EHLO d.jc.ca
> 250-ems.jc.ca
> 250-PIPELINING
> 250-SIZE 20240000
> 250-VRFY
> 250-ENHANCEDSTATUSCODES
> 250 8BITMIME
> DEBUG SMTP: Found extension "PIPELINING", arg ""
> DEBUG SMTP: Found extension "SIZE", arg "20240000"
> DEBUG SMTP: Found extension "VRFY", arg ""
> DEBUG SMTP: Found extension "ENHANCEDSTATUSCODES", arg ""
> DEBUG SMTP: Found extension "8BITMIME", arg ""
>
> If I use telnet to ems.jc.ca and then manually prepare a message it works.
>
> Brian
>
> ------------------------------------------------------------------------
> *From:* Martijn Brinkers via Users <users@lists.ciphermail.com>
> *Sent:* June 10, 2020 12:08 PM
> *To:* users@lists.ciphermail.com <users@lists.ciphermail.com>
> *Cc:* Martijn Brinkers <martijn@ciphermail.com>
> *Subject:* [CipherMail User] Re: EHLO Disconnect
>  
> On 09-06-2020 20:46, bmaclenn--- via Users wrote:
>> I am receiving a timeout after EHLO from system[IP]
>> diconnect from system[IP]
>>
>> From system[IP] I can telnet and send email correctly? Any ideas where to look?
>
> So this is for incoming connections?, i.e., from a remote SMTP to the
> CipherMail gateway?
>
> The SMTP part of the CipherMail gateway is handled by Postfix.
>
> Is there more information from the logs? Can you check the logs on the
> other system?
>
> Kind regards,
>
> Martijn Brinkers
>
> --
> CipherMail email encryption
> Email encryption with support for S/MIME,
> OpenPGP, PDF encryption and secure webmail pull.
>
> W: https://www.ciphermail.com/
> E: info@ciphermail.com
> T: +31 20 290 0088
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--
CipherMail email encryption
Email encryption with support for S/MIME,
OpenPGP, PDF encryption and secure webmail pull.

W: https://www.ciphermail.com/
E: info@ciphermail.com
T: +31 20 290 0088