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Emails appear to be sent but not getting to the recipient - No errors generated

Posted on 2009-03-30
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Last Modified: 2013-11-30
We have a SBS 2003 server with exchange. In the majority of cases emails that are sent from the organisation are being received by external recipients.

However in a few cases the exteneal recipient is not receiving any emails from us. We are not getting any undelievererable errors, so the only way we know that the recipient is not receiving them is by speaking to them on the phone.

I dont think that the messages are going into the recipients junk email folder.

Any suggestions.
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Question by:roy_batty
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7 Comments
 
LVL 12

Expert Comment

by:florin_s
ID: 24017998
Hi,

Do a message traking to see where the mails are, also check the queues.

You can get a header of a mail that was sent and check it here:
http://www.mxtoolbox.com/EmailHeaders.aspx
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LVL 1

Author Comment

by:roy_batty
ID: 24019218
OK. I have tracked the message and can see that the message has left our organisation. I have also checked the queue and the message is not stuck in there.

I presume that checking the header is only useful if the message had been received at the other end?

Is that right?

So as I am not receing any error messages, dos this mean the problem is not related to our system.
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LVL 12

Accepted Solution

by:
florin_s earned 2000 total points
ID: 24022443
yes it means that the problem is related to their system.
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LVL 12

Expert Comment

by:florin_s
ID: 24022465
oh, one more thing, what are you using to transfer the messages out, are you using another company's mailhub or?
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LVL 1

Author Comment

by:roy_batty
ID: 24054684
We were transfering straight onto the internet. I recently added a smarthost, but this has not made a difference to this issue.

( I have recently received a 4.4.7 error back from some, but not all of the domains in question)
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LVL 12

Expert Comment

by:florin_s
ID: 24056968
this could be because many companys now have greylisting implemented, here are some links that can help:

http://www.greylisting.org/
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_23176470.html?sfQueryTermInfo=1+10+4.4.7+greylist
http://support.microsoft.com/kb/284204

you can try also this:

"Changing the time out is not really something I would advise. If you cut it down to something like an hour then you do not have any flexibility in the event of a problem with you, your ISP or the recipients ISP or SMTP server.

If you got the messages after a restart of the service then you might have seen the greylisting bug, particularly if the queues were clear.

You can deal with greylisting bug by a small registry change.
Copy and paste this to notepad and then save it as a .reg file and merge it.

---Cut here---

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SMTPSVC\Queuing]
"GlitchRetrySeconds"=dword:00000078

---Cut here---

The other cause I have seen is antivirus software hanging on to the message.
In both cases the queues would appear to be clear.
"

here is the link:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_22611994.html?sfQueryTermInfo=1+10+4.4.7+greylist
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LVL 1

Author Closing Comment

by:roy_batty
ID: 31564284
Thanks for all the help and sorry for taking so long to award the points.
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