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

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

Final-Recipient: rfc822; recipient<_at_>
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
[26/Mar/2014 10:34:07][4609568768] {smtps} Looking up address in DNS blacklist SpamHaus SBL-XBL...
[26/Mar/2014 10:34:13][4609568768] {smtps} Command EHLO
[26/Mar/2014 10:34:13][4609568768] {smtps} Sent reply to EHLO: 250 ...
[26/Mar/2014 10:34:13][4609568768] {smtps} Command MAIL FROM:<prvs=916158e28f=sender<_at_>>
[26/Mar/2014 10:34:14][4609568768] {smtps} Sent reply to MAIL: 250 2.1.0 Sender <prvs=916158e28f=sender<_at_>> ok
[26/Mar/2014 10:34:14][4609568768] {smtps} Command RCPT TO:<recipient<_at_>>
[26/Mar/2014 10:34:14][4609568768] {smtps} Sent reply to RCPT: 250 2.1.5 Recipient <recipient<_at_>> ok (local)
[26/Mar/2014 10:34:15][4609568768] {smtps} Command DATA
[26/Mar/2014 10:36:15][4609568768] {smtps} SMTP server connection from 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.

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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