Can we reply to user without using @ mail system?

Can we reply to user without using @ mail system?

I have installed the latest version of manage engine free edition. And also 1 requester is created. After creating a requester,the requester was able to send a request to administrator. When I tried to reply the ticket,it asked me to reply the mail with @ email format. Can I reply without @ mail format and putting specific name like "Tony" and reply directly to the requester?

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