Exchange - Some incoming mails are not arrived the recepient - FW not blocked and Message Tracking not found - where they go?

Exchange 2013 - Some incoming mails are not arrived the recepient - FW not blocked and Message Tracking not found -
where they go?  Could anybody give me an advice?
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Mandy_Asked:
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Peter HutchisonConnect With a Mentor Senior Network Systems SpecialistCommented:
Check that the messages are still not queuing for delivery, see the Exchange Queue Management console and point it to each of the Hub Transport servers to view the queues on each server.
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JohnBusiness Consultant (Owner)Commented:
Were the emails sent , or were they bounced back at the sender?  Maybe the emails never arrived.

Do you have third party spam filtering that stopped the emails?  Look in the spam quarantine.

Those are the two predominant reasons why you would not get email.
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Mandy_Author Commented:
I can see the mails on the firewall. they were scanned by virus_scan successfully and they also not
declared as spam. the watchguard fw not forwarding. i dont know
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JohnConnect With a Mentor Business Consultant (Owner)Commented:
Does your firewall include grey listing? You need to track through the firewall logs as it does not appear to be an Exchange issue (unless the firewall is putting in a different folder).
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Mandy_Author Commented:
thank you for assistent
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