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GaryKing

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Very intermittent, sometimes e-mails from overseas bounce back, here's the NDR and smtps log:


NDR:
***************************
X-Symantec-Messaging-Gateway-Queue-ID: 6E/15-04072-4A961335
X-Symantec-Messaging-Gateway-Sender: rfc822; prvs=916158e28f=sender<_at_>overseas.com
Reporting-MTA: dns; mail.overseas.com
Arrival-Date: Wed, 26 Mar 2014 00:33:56 +0100

Final-Recipient: rfc822; recipient<_at_>local.com
Status: 4.4.2
Action: delayed
Last-Attempt-Date: Wed, 26 Mar 2014 00:33:56 +0100
Diagnostic-Code: smtp; 451 4.4.2 [internal] connection closed by remote host

Debug log with SMTPS enabled
***************************
[26/Mar/2014 10:34:07][4609568768] {smtps} Task 358748 handler BEGIN
[26/Mar/2014 10:34:07][4609568768] {smtps} Task 358748 handler starting
[26/Mar/2014 10:34:07][4609568768] {smtps} SMTP server session begin; client connected from mail.overseas.com:2402
[26/Mar/2014 10:34:07][4609568768] {smtps} Looking up address 123.123.123.123 in DNS blacklist SpamHaus SBL-XBL...
[26/Mar/2014 10:34:13][4609568768] {smtps} Command EHLO mail.overseas.com
[26/Mar/2014 10:34:13][4609568768] {smtps} Sent reply to EHLO: 250 mail.local.com ...
[26/Mar/2014 10:34:13][4609568768] {smtps} Command MAIL FROM:<prvs=916158e28f=sender<_at_>overseas.com>
[26/Mar/2014 10:34:14][4609568768] {smtps} Sent reply to MAIL: 250 2.1.0 Sender <prvs=916158e28f=sender<_at_>overseas.com> ok
[26/Mar/2014 10:34:14][4609568768] {smtps} Command RCPT TO:<recipient<_at_>local.com>
[26/Mar/2014 10:34:14][4609568768] {smtps} Sent reply to RCPT: 250 2.1.5 Recipient <recipient<_at_>local.com> ok (local)
[26/Mar/2014 10:34:15][4609568768] {smtps} Command DATA
[26/Mar/2014 10:36:15][4609568768] {smtps} SMTP server connection from mail.overseas.com lost: (2) No such file or directory
[26/Mar/2014 10:36:15][4609568768] {smtps} SMTP server session end
[26/Mar/2014 10:36:15][4609568768] {smtps} Task 358748 handler END

Have you seen this "No such file or directory" before? Any idea what file or directory is it referring to?

Thanks in advaned.

GK.
  •  
Pavel Dobry (Kerio)

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The error indicates that Kerio Connect server did not receive data in two minute time period and network connection has reached a timeout due to inactivity. Probably some firewall or antispam appliance is delaying the email content for too long.
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