Delays in mail delivery

I've recently noticed big delays in the time that messages show up in my Mail app, sometimes hours after they were sent to me. Today I noticed that there were at least ten messages visible to me on the mac.com web site, but I couldn't get those messages until I forced a mailbox synchronization.
Is anyone else experiencing something similar? Any resolution to this?
Thanks
Nestor

Hi Richard,
I recommend you to do few testing to narrow-down the root cause 
Does this mail delivery getting delayed only for  external users or its both for internal and external users ?
How many Exchange servers  you have ? Is this a combination of HUB & CAS together if its 2013 or you have them Separately?
Do you have any antispam configured in your environment ?
Is there any antivirus installed in the exchange servers?
I would recommend you to run Get-TransportAgent and see the list of transport agents installed on your Exchange servers
As a part of testing i would suggest you to disable all the transport agents installed on the servers disable antivirus send a test email and check if the delay is happening or not . Also disable the exchange antispam if its installed and see if the mail
delay exists. Because mostly any transport agents acting in the categorization part might be causing this problem if their configuration has any problem.
Let us know the results so that we can proceed further.
Please mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you.
Regards, 
Sathish
Sathish

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    Hi Richard,
    I recommend you to do few testing to narrow-down the root cause 
    Does this mail delivery getting delayed only for  external users or its both for internal and external users ?
    How many Exchange servers  you have ? Is this a combination of HUB & CAS together if its 2013 or you have them Separately?
    Do you have any antispam configured in your environment ?
    Is there any antivirus installed in the exchange servers?
    I would recommend you to run Get-TransportAgent and see the list of transport agents installed on your Exchange servers
    As a part of testing i would suggest you to disable all the transport agents installed on the servers disable antivirus send a test email and check if the delay is happening or not . Also disable the exchange antispam if its installed and see if the mail
    delay exists. Because mostly any transport agents acting in the categorization part might be causing this problem if their configuration has any problem.
    Let us know the results so that we can proceed further.
    Please mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you.
    Regards, 
    Sathish
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