SBS 2008 POP3 Connector problems

I have a problem troubleshooting an unreliable POP3 connector in SBS 2008.

It is mostly working OK, but on one account emails are not being delivered to the users mailbox.  Emails ARE being collected from their POP3 box on the internet (because they only remain there for a short while) - these emails are addressed to the users Primary email address by the way..  The Message Tracking system does not show these emails as being received by the user,  but internal emails and emails from other POP3 boxes for the same user DO appear.
The POP3 connector (when forced to collect) says that there was a problem, and suggests looking in the Error logs, but I cannot find any messages related to this in the logs.  Where do they go?  In SBS 2003 they used to appear in the Application log with the source as POP3 connector.
ANy help troubleshooting would be appreciated.  The user is currently collecting these emails ditect from Outlook at the moment.  Regards Chris
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chris_shawAsked:
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chris_shawAuthor Commented:
I think I have found the cause of this problem - I am just checking it out.
It seems that (amazingly) the default settings in Exchange 2007 when you set up SBS 2008 (even you opt NOT to install Microsofts anti-spam and anti-virus products like I did), are still to content filter incoming mail and simply dispose of email it considers to be spam.
The setting is Exchange Console, Organistaion Configuration, Hub Transport.  Select the Anti-spam tab.  There is a content filtering setting in there as well as other that refer to IP block lists etc.  I disabled them all, and so far, it looks like it has done the trick.  I prefer to leave the spam handling to my Trend WFB.
I will update this post later to let you know if it is the correct solution, or if the problem persists.
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tomcahillCommented:
http://blog.mpecsinc.ca/2009/03/sbs-2008-troubleshooting-and-sbs-pop3.html

The above blog post shows where the logs are.  still in event viewer but as you may have noticed Event Viewer is much more detailed in SBS 2008.

If you post the error being reported we can work on resolving it.  Since the email is being downloaded the blog post will not provide a total solution, just point you to the correct place in the new Event Viewer.
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chris_shawAuthor Commented:
Thanks you so much for that pointer to where the error logs are kept.

Having looked at them, the errors were to do with another account, and have nothing to do with the account which is having a problem.  The emails collected during the day, just seem to have disappeared.  I am using Trend Micro Worry Free Advanced as an AV product.  I will make further checks to see if that could have anything to do with it.

I am still puzzled as to why these emails are not picked up by the Message Tracker.
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tomcahillCommented:
Try accessing the users mailbox from OWA and make sure it is alright.

If it is, try removing the POP3 connector for that user and re-creating it.

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chris_shawAuthor Commented:
Yes I used OWA as an alternative to the Outlook client just to check that the emails were not present there either.  They weren't.
I shall try what you suggest, thank you.
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chris_shawAuthor Commented:
I should add - that since my original post, I got complaints from other users that they were not receiving SOME emails, so this escalated the problem from just the one user mentioned.
Chris
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tomcahillCommented:
so it sounds like you have got it nailed down to the culprit.
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VinzZCommented:
Perfect. Thanks for the answer!!
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