Thanks Frank for the reply.

However, the problem was still there by changing the server name to IP.

Actually, the machine was a Windows 2003 Server running on a P4-3G 1GB
environment. Trendmicro ServerProtect was running. ServerProtect only ran,
as its product feature, for Real Time Scanning but there was no email virus
scanning. Only one user was using that machine at the test time. From Task
Manager, the CPU Usage was very low. There was also no paging file swapping
(actually commit charge is less than physical). So, the machine should not
be running very slow.

Just to compare, there was no problem in using ThunderBird to send email
message to myself (i.e. the same as the sender account). There was also no
problem to send by directly using Telnet to control the SMTP using RFC
commands. RCPT TO and DATA could all be responded. Actually, the error
window popped up almost instantly after pressing SEND. So, it could not be a
timeout issue. Right? The email server log showed that the RCPT TO "myself"
command had been responded but the smtp log file in OE6 showed no response
afterwards.


"Frank Saunders, MS-MVP OE/WM" wrote in message
...
"boy" wrote in message
...
In these few days, there was strange behaviour from OE 6.00.3790.0 on
Windows 2003 (with ServerProtect running). Mail messages with myself
(same email address as my account's email address) copied (no matter CC
or BCC) failed to deliver.

--- QUOTE
Your server has unexpectedly terminated the connection. Possible causes
for this include server problems, network problems, or a long period of
inactivity. Subject 'MySubject'. Account : 'MyAccount', Server:
'smtp.myisp.com', Protocol: SMTP, Port: 25, Secure(SSL): No, Socket

Error: 10053, Error Number: 0x800CCC0F.
--- QUOTE

It was noted that the SMTP negotiation was stopped at OE side after SMTP
server's accepting my email address in "RCPT TO". It was apparent that
OE6 client did not react since then, thus causing delivery problem.

*** Thunderbird running at the same time could work.

What's wrong? Is it due to windows update, because the OS was recently
updated. Or, is the server infected?



This is usually caused by an anti-virus set to scan email.

Turn off email scanning in your anti-virus. It provides no added
protection. After doing so it may be necessary to reset the server names
in OE.

The Other E-Mail Threat: File Corruption in Outlook Express
Published: November 18, 2004
By Tom Koch
http://www.microsoft.com/windows/IE/...orruption.mspx

Email scanning slows down Sending and Receiving, sometimes enough that OE
times out. Since some of the received messages have large (often virus)
attachments, which exasperates the problem.
Some Comcast users have found it necessary to totally uninstall Norton and
switch to the free AVG with mail scanning off. Norton invented email
scanning and here's what they say:

"Disabling Email Scanning does not leave you unprotected against viruses
that
are distributed as email attachments. Norton AntiVirus Auto-Protect scans
incoming files as they are saved to your hard drive, including email and
email attachments. Email Scanning is just another layer on top of this. To
make sure that Auto-Protect is providing the maximum protection, keep
Auto-Protect enabled and run LiveUpdate regularly to ensure that you have
the most recent virus definitions."
http://service1.symantec.com/SUPPORT...256c7500723cf0

"...your computer is protected if Auto-Protect is enabled. Auto-Protect
scans any incoming files, including email attachments, when the files are
saved to your hard drive."
http://service1.symantec.com/SUPPORT...01100907323806

"NAV provides multiple layers of protection. Email scanning is just one of
those layers. Even if you are not running Email Scanning, your computer is
protected against viruses that are distributed as email attachments by NAV
Auto-Protect. Auto-Protect will scan any incoming files, including email
attachments, as they are saved to your hard drive. To make sure that
Auto-Protect is providing the maximum protection, keep Auto-Protect
enabled
and run LiveUpdate regularly to ensure that you have the most recent virus
definitions."
http://service1.symantec.com/SUPPORT...= bar_sch_nam

See also
http://help.expedient.com/mailnews/n...ntivirus.shtml

So Symantec used to say this often and clearly. The newer stuff doesn't
have the statement included as it was considered an embarrassment. If you
know anyone who programs for Norton try to get them to talk about it.

--
Frank Saunders, MS-MVP OE/WM
http://www.fjsmjs.com
Answer in newsgroup. Don't expect an answer to email.