Hi @Muhd Amir Rashidi Bin Hamzah , welcome to the Community!
Your email address returned a bounced message to our mail service on October 31, which kept additional emails from being delivered. I've cleared that delivery pause from our mail service, so additional attempts should go through.
I might suggest having an Office 365 administrator at your organization create a Mail Flow rule in the Exchange Admin Center to mark Atlassian-originated emails as safe/allow them to bypass spam filtering. Our outbound email IP addresses are publicly documented for this purpose:
22.214.171.124/17, 126.96.36.199/20, 188.8.131.52/20, 184.108.40.206/17, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168
When using an Atlassian account that is not managed, it’s possible to change the email address, but we often receive the following notification on the email that we want to use: Sorry, we couldn'...
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