undelivered legitimate email in exchange 2003

About 2 weeks ago emails that I sent from home to work stopped arriving.
I traced the emails through the ISP from where they are popped off correctly.
I turned off the server 'delete SPAM and virus' and had it quarantine instead.
I've now checked the exchange log file and find that the emails arrive.
I've looked in message tracking and find:
 SMPT: Message delivered locally to ...
 SMPT: Message scheduled for retry ...
This is repeated 100's of times until it ends with:
 SMPT: Non delivered report
I have had reports from others who email me that I am not answering their emails - but I have not received any emails.
What is happening here and how do I correct it?
AndrewJohnGrahamAsked:
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Larry Struckmeyer MVPCommented:
the exchange pop3 connector is a kludge, meant for temporary use while SMTP mail is setup.  I still urge you to change to smtp mail or find a replacement pop3 connector.  Look at this list, and no, I am not advocating a specific POP3 connector.

http://www.dataenter.co.at/doc/popbeamer_compare.htm
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Larry Struckmeyer MVPCommented:
How is the mail delivered to the SBS Exchange server?  SMTP direct?  Though a third pary filter?  POP3?

From your description, I suspect the native exchange pop3 connector.  if so, I suggest you either convert to SMTP mail or change to a third party pop3 connector.  You can find such on the internet.
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AndrewJohnGrahamAuthor Commented:
Thanks for the feedback.
Yes, you are correct. At the moment it is using the native POP3 connector.
I'll try SMTP mail on my own work account and have a look for third party POP3 connectors.
What is throwing me is that everything was working fine until 2 weeks ago and there have been no changes in that period - other than Microsoft updates.
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AndrewJohnGrahamAuthor Commented:
Hi,
 I've tried direct SMPT connection and it has the same result. 'Message delivered locally' then 'message scheduled for retry'.
 Has anyone got any other ideas?
 Thanks.
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AndrewJohnGrahamAuthor Commented:
Okay. I've got it working.
I did a new search on 'message scheduled to retry' and found http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_26514355.html.
I removed the mailbox, created a new mailbox and deleted and remade my user profile. Everything came back.
I've had to do this before with other users - but never had these symptoms before.
Thanks for your help.
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AndrewJohnGrahamAuthor Commented:
As suspected I've used POP so that during a move of premises whilst the ISP was unreliable and our connection kept dropping out I was able to 'queue' mail at the ISP instead of losing it. We've been there for a couple of months now so I suppose I should be save to move back to SMTP.
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