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I think as long as you use only one email address for three of them you cannot.<br />
<br />
try this:<br />
Uncheck all the email addresses in the iMessage Settings page for first device. Then assign one of your email addresses to your second I Devices, and then another email to another I device.
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Hi,<br />
<br />
I have 3 devices (Mac, iPhone and iPad) all setup to use iMessage ... if a message was issued to a 3rd party how would I determine from which device the message was sent.<br />
<br />
J
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Hi,

I have 3 devices (Mac, iPhone and iPad) all setup to use iMessage ... if a message was issued to a 3rd party how would I determine from which device the message was sent.

J

How Do I Find Out Which Device Sent An iMessage

iPad is an iOS-based line of tablet computers built around the device's multi-touch screen, including a virtual keyboard. The iPad includes built-in Wi-Fi and cellular connectivity on select models. An iPad can shoot video, take photos, play music, and perform Internet functions such as web-browsing and emailing. Other functions – games, reference, GPS navigation, social networking, etc. – can be enabled by downloading and installing apps.

iPad

The iPhone is a smartphone made by Apple Inc. It and the iPad, along with several other mobile devices from Apple, run on the iOS operating system, which has its own topic, as does the iPad for device-specific questions. Native iOS applications are written in Objective-C or in Swift using the Cocoa Touch frameworks or HTML5 compiled with the help of a package manager such as Adobe PhoneGap; a common IDE is Xcode.

iPhone

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.