Send mail from account’s dedicated IP - "Received by" in email body

I setup exim configuration using WHM to "Send mail from account’s dedicated IP", but in email body I still see:

Code:

Received: from c-24-8-59-187.hsd1.co.comcast.net ([24.8.59.187]:52713 helo=[192.168.2.5])
	[B][COLOR="#FF0000"]by server.myserver.com with esmtpsa[/COLOR][/B] (TLSv1: DHE-RSA-CAMELLIA256-SHA:256)
	(Exim 4.82)
	(envelope-from <email@mydomain.com>)
	id 1X0Cwj-0001zN-8J
	for email@mydomain2.com; Thu, 26 Jun 2014 10:54:49 -0600
Message-ID: <53AC5060.60505@mydomain.com>
Date: Thu, 26 Jun 2014 10:54:56 -0600
From: Sam <email@mydomain.com>
User-Agent: Mozilla/5.0 (Windows NT 5.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/22.2.0
MIME-Version: 1.0
To: John <email@mydomain2.com>

How to remove the part: by server.myserver.com with esmtpsa from email body?

I tried edit 'exim.conf' by: http://forums.cpanel.net/f34/how-setup-cpanel-send-email-domain-off-ip-setup-212502.html,

but it's not working.

Also SPF record for mydomain.com still pointed to main server IP?

Any advices, please?