change domain login for exchange server 2016

Hi Experts,
I have exchange server 2016 installed and working. The exchange is connected to the domain controller: dc.companyname.com.
The exchange authentication uses the format: name.lastname@dc.companyname.com.
Is it possible to change it to use: name.lastname@companyname.com without the dc prefix?

Thanks
xtremerealityAsked:
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☁ François Peroux ☁Infrastructure Consultant - Cloud Solutions | Consultant Infrastructure - Solutions CloudCommented:
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Ibrahim BennaTechnology LeadCommented:
You can add a new domain suffix to active directory and then you will have to change all users' UPN to match this new domain.

https://www.concurrency.com/blog/w/change-user-principal-names-to-match-email-address
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xtremerealityAuthor Commented:
Thank you, this is exactly what I need
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