Emails sent are not being received by recipient

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I am using Outlook 2007 installed via Office Professional 2007.  Up until a 
couple of months ago, all seemed well.  
When I use REPLY or REPLY ALL to an email is it not always received by the 
recipient.
It sends, shows in the sent box, but the recipient does not recieve it.  
There are NO indications it did not go out, and I don't get an error email 
saying it did not get received or their was a problem.  ALL INDICATIONS POINT 
TO IT WAS RECEIVED.

When I REPLY or REPLY ALL directly from my comast account, there are no 
problems.  Therefore it seems to be an OUTLOOK 2007 problem as I have not 
experieneced it in OUTLOOK 2003.   
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Reply Utf 2/22/2010 3:33:01 PM

Skywalker111 wrote:

> I am using Outlook 2007 installed via Office Professional 2007.  Up until a 
> couple of months ago, all seemed well.  
> When I use REPLY or REPLY ALL to an email is it not always received by the 
> recipient.
> It sends, shows in the sent box, but the recipient does not recieve it.  
> There are NO indications it did not go out, and I don't get an error email 
> saying it did not get received or their was a problem.  ALL INDICATIONS POINT 
> TO IT WAS RECEIVED.
> 
> When I REPLY or REPLY ALL directly from my comast account, there are no 
> problems.  Therefore it seems to be an OUTLOOK 2007 problem as I have not 
> experieneced it in OUTLOOK 2003.

If the message moves from the Outbox folder to the Sent Items folder then
Outlook got an +OK status back from the mail server indicating that the mail
server successfully accepted the e-mail.  Outlook is done.  It's up to
whatever is the mail server to do the rest.

Perhaps what you think is the mail server isn't the one out on the Internet
but actually running on your host.  Some anti-virus (AV) programs pretend to
be the mail server.  Rather than interrogate the e-mail traffic byte-by-byte
during transmission, they grab the entire message.  They do this by
pretending to be the mail server accepting the e-mail.  The e-mail client
gets an +OK status back from the mail server to which it connected but that
happens to be the AV program and not the real mail server.  It is then up to
the AV program to become the client and complete the transmission of the
message to the real mail server.  If the AV program, as the client, fails to
send your e-mail to the real mail server, there is be no indication of that
failure back in Outlook.  After all, Outlook completed its transaction
successfully so it was no longer in the loop.  You have to look at the logs
in your AV program to check if *it* had a successfull transmission with the
real mail server.  I believe this is how McAfee AV works.

E-mail scanning by your AV program is superfluous.  It affords you no more
protection than is already provided by the on-access (real-time) scanner.
Disable the e-mail scanner in your AV program.  Sometimes that is not
sufficient to get the AV program out of the flow of your e-mail traffic
(i.e., the AV's transparent proxy remains in the path; disabling it merely
means it doesn't interrogate the traffic but the traffic still goes through
it, so if there is a problem with their proxy then you still end up with
e-mail transmission problems).  You may have to uninstall the AV program and
then do a *custom* install where you elect to NOT include their e-mail
scanner component.
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Reply VanguardLH 2/22/2010 8:13:28 PM

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