Mail not reaching Mailbox?

To me this sounds bizarre, but maybe not to someone's experienced
I've a bespoke application,  that sends email by SMTP
I've had one user say the dont get the email. Allegedly.
Where could I check? He's not having issues with any other messages from any other senders.

I've checked the Exchange server where the persons mailbox is and it says that it recieved the
messages from the sender. Can a message not hit the mailbox after that?

Thanks a lot
deesloopAsked:
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deesloopAuthor Commented:
Apologies. OK. Its just the MS website says otherwise.
I'll have a look when his laptop come in.
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deesloopAuthor Commented:
And yes, exchange also says it was delivered eg it hit the mailbox.
 
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Can you once verify if they are in the deleted items folder, is it the same if we have a look from OWA?
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deesloopAuthor Commented:
They're not in the deleted items folder and not in OWA.
I've tried a recov er deleted item and it's not there - he appears not to have delted it.

I sent a test from the same address and the same machine this morning and it arrived.
I had thought of something rules based but it would have fired on that message.
It's odd....
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
If the message tracking in exchange says that the email was delivered to the mailbox, then it has.

It might be that the message is not visible because of

views in outlook
rules to delete or move it to a different folder
user has shift deleted it.
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deesloopAuthor Commented:
Shift and delete is the only thing I could come up with.
The rule would have fired for the new message so it cant be rules
And the same would apply (I'd have thought) for the views also.
No other explanation is there?
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
To make sure that it is a shift delete from the user part, configure the DumpsterAlwaysOn registry key into the client PC and recover all shift deleted emails, if they fall within the retention policies,

Go through http://support.microsoft.com/kb/886205 for the registry tweak.
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deesloopAuthor Commented:
Hmm, thats a thought.
I can recover see other things he's deleted normally.
Is this to recover things that are shift-deleted on top of the normally deleted stuff?
Maybe I could look at the backup logs...
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deesloopAuthor Commented:
Oddly enough he must have either not got it, or shift and delted it before the day was out.
Most wierd...
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Yes, you will be able to recover shift deleted items which have been deleted from any folder.
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deesloopAuthor Commented:
Unfortunately that only wokrs from when you enable it according to MS.
We'll see what happens in the next few days.....
Its wierd cos he asked the sender to print it out and send it to him instead>
I dont see whyhe'd get it delivered, shift-delete it then ask  for it.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Is there any Third party software on the client machine or any Add-ons in the Outlook. Can you disable the Add-ons and any third party and then verify.
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deesloopAuthor Commented:
Alas I cant he's remote and seldom checks his email.
However I cant imagine he would have as he's a non power/non admin user....
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Putting the regitry tweak in place shows all deleted emails IMMEDIATELY. It goes back to the date your retention policies matches.
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