I can spot not only the username, but also the return address pointing to the default mail id… ie. username@boxxx.bluehost.com, and more smtp details, like

Received: from unknown (HELO boxxx.bluehost.com) (70.103.189.xx)
by mailproxy1.bluehost.com with SMTP; 06 Jan 2010 14:49:44 -0000
Received: from localhost ([127.0.0.1])
by boxxx.bluehost.com with esmtp (Exim 4.52)
id 1FDNDT-0002Cq-Nf
for xxxxxxx@hotmail.com; Wed, 06 Jan 2010 07:49:43 -0700

I wanted to show my own email instead of  [username]@box[nn].bluehost.com, so after some research i discovered that PHP consults the server for that data, and it can be changed in your PHP.ini file.

To do this:

1. Open your PHP.ini file (from public_html/ directory)
2. Search for ;sendmail_from =
3. Change the value to desired email (in my case it was me@localhost.com, and i changed it to adresar-noreply@smestaj.info)
4. Now all the emails send using PHP send mail on your Bluehost site should have ‘From’ field the same like you set in your PHP .ini file.

I hope this works for you.

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