Exchange ActiveSync working but I get error message...

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Hi,

I just set up my corporate email account (Exchange ActiveSync) on my Galaxy S4 using the stock email client.

I am getting my work emails, but when I click "Show Images", I get the following error message below all the time below.

Unable to open connection to server.
Security error occurred.

How can I prevent this error message from coming up? Are there any additional settings I need to implement? My device is using a high security password to open the device

Thanks.