@Vince_Leung Welcome to the Community!. I don’t know if you are using the older email feature of Asana or one of the two add-ins that are available. I am the developer of Sendana Outlook To Asana - Sendana - #108 by James_Carl or the Asana developed Add-in for Outlook. I used the original feature 3 years ago but had a passion to develop a much more full featured product. Both of the current add-ins are superior in my mind to the original email method.