change primary domain on hosting to another domain on same hosting

[snitzle]

I want to change my primary domain on hosting plan  to another domain on same hosting

[bseetan]

Hi,

I faced problem on my email. My email displayed to another company name instead of our company name.

(i.e the email address is correct but displaying name is different)

How to change it and display back our original company name.

Thanks for help.