Exchange system 2010 delay receiving mail from outside

Hi Experts,
Recently, some users in my company reported that when a outside user (domain [email protected]) send mails to our users, maybe have attachments or not, some of them were delayed for a half of day. For example, yesterday, customer send mail at 1:00pm but our
user has received it at 4:00am today.
Before that, because our user reported that problem so i suggest her to require customer send mail to both our exchange system and a personal mail (yahoo mail). So today, our user said that she recieved mail in yahoo on time, but delaying in exchange. She
sends/recieves with other users in my company and other customers ok.
My topo: Mailbox - ClientAccess/HubTransport - Fortimail - Internet.
I checked my fortimail and see that fortimail server also received mail at 4:00am.
I think that:
- If customer mail system has error. Why they still send mail to yahoo ok? They use promailserver.
- If our system has error. Why we still receive mails from other customers.
- I don't know if we have any problem with our physical connections but if that, we must have more reports than that (we only have 2 or 3 users reported delaying mail).
May anyone know the reason or have any advices for me in this case? Thanks in advanced.

Hi Khoa_PD,
Agree with Nithyanandham, you can check the header of the email in your user's mailbox which received from the customer, it could help us to check where the message delayed via time stamp.
You can refer to the following article to understand message herders:
View e-mail message headers
Best regards,
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Niko Cheng
TechNet Community Support

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