how to let clients only type the username instead of user@domain.com

i use cpanel under redhat OS

i would like to let my clients type only the username of their mails in outlook express instead of letting them to type username@domain.com

does any body has an idea how to implement that ??

i know there is nothing straight forward in the cpanel control panel , and i am expecting that something should be changed in exim.conf

and thanks

 

 

 

 

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