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We have several users having issues sending and receiving emails. They state that it takes hours or days to receive emails. They state that it takes a significant amount of time to send emails (without attachments).
These users have laptops that travel between home (use VPN) and office. We verified that they are not on WIFI (or connected to WIFI) when in the office. The majority of the issue is in the office. We are on-premise with Exchange 2013. The outlook client is 2016. If the user closes and re-opens outlook, emails will come in. If the user click send/receive they will receive the emails.
The users also have shared mailboxes. At least 5
I did do a DNS flush on one of the users laptops and she said it was fine for a few days.
As a test, our tech set the inbox to automatic send receive every 30 minutes for one of the affected users. We have not heard the results as of yet. Don't think this is the answer.
Any advice, troubleshooting ideas/tools would be appreciated. Thanks.
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Hi @mara2021
May I ask if you have done some changes on the Exchange server before this issue occurs?
For example, installed Exchange CU or SU updates.
And do the affected users have something in common, like they all have shared mailboxes?
is there a large amount of folders in their mailboxes?
If you are using Outlook cached mode, please switch to online mode and see if it can help with this issue.
Please refer to this link about how to switch between cached mode and online mode: Turn on Cached Exchange Mode
Thank you. Most of the affected users do have shared mailboxes. They do have folders. Most are laptop users with VPN. We do use cache mode.
Hi,
Thanks for the update.
Have you tried online mode?
If the cause in this case is too many folders, it would help with this issue.
Hi @mara2021
I am writing here to confirm with you how thing going now?
Did the issue get resolved?
You can monitor Exchange Server health with the native method.
Step 1 - Monitor Server Availability and the Status of Exchange Services
Step 2 - Monitor SMTP performance, CPU and Memory usage on an Exchange Server
Step 3 - Track the Message Queue
Also, remove the external DNS from the exchange. If it uses this as DNS when trying to resolve internal clients, it may fail. It might happen because Google DNS servers know nothing about your internal network. Your internal systems should point to internal DNS only.
I hope this will help you.
Please mark as "Accept the answer" if the above steps helps you. Your suggestion will help others also !
Willl try your suggestions. Thank you.