Headers problem? Exim?

Hi,
my customer is complaint that when she send an email, on outlook shows:

From: Carla beiro [carlabe@my_server_hostname]; in name of; Carla beiro [carlabe@her_domain.com.br]

She said:

Why shows From: Carla beiro [carlabe@my_server_hostname]; and not Carla beiro [carlabe@her_domain.com.br] only...

What i need to do to fix that!? And on webmail too.

I actually use cpanel/centos 3.6/exim4.52

Thanks for any help.

 

 

 

 

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