Email Timestamp Issue

Hi all,

For this issue I need to illustrate and I hope someone can point me where on the mail server has been mis-configured.

(1) Receive an email message in Inbox from a user from located in US, message timestamp 02 Nov 10:05AM (This is in GMT +8)

(2) I replied his email and CC myself, the message timestamp on his original message is 01 Nov 09:05PM (This is in EST)

Unfortunately, the timestamps do not have extra information like GMT +8 or EST to correct indicate the time vaue and hence have caused some confusions to users.

Both of our mail databases are on a US-based server. Am I missing some configurations? My PC date/time is already set to GMT +8.

Thanks in advance!