When composing a message in SR, how to populate all email addresses?

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Auto SRs being generated via Inbound email. When a user sends an email to raise an SR and keep other persons in CC, we can see the icon which shows the To and CC details in the Messages tab of the SR. While composing a response from messages, only the To address is coming by default. The requirement is it should by default include all the emails mentioned in To and CC from the original email. Currently, we have to manually select the other emails(mentioned in the original email) while composing a response. How can it be achieved?