receive mail internal too slow from Exchange 2013

[Kitti]

We have noticed that when we send an internal email to a group, it takes time to receive an email. Example if I use my email to send to Everyone (500 emails) with no attachment about 50KB it takes 20 minutes for everyone to receive.  However, If I send it at the same time to my Hotmail account, it only takes less than 30 seconds to receive. 

[PerWerngren]

Is it perhaps RPC over HTTPs (aka Outlook Anywhere) that is the cause? When people are in their office (ie logged in to the domain), they don't need RPC over HTTPs and I have a vague memory that this feels like you got a delay.

Regards, Per

[Kitti]

How to I'm checking this problem of RPC over HTTPs?

[PerWerngren]

You will see this in the settings for how Outlook communicates with Exchange (look in Account Settings).

I'm not a techical expert myself, but I know that you can control these settings for everyone in your office through a Group Policy (GPO). 

Regards, Per