Try examining the email headers (on a decent email client something like Menu -> View source*).
If it's genuine then you'll see the
Received: header, etc as being from Michelin.
It's possible to fake those, but quite often they don't bother.
Return-Path: <<never you mind!>@uk.michelin.com>
Delivery-Date: Tue, 25 Jun 2013 17:16:17 +0200
Received: from gk-fr3.michelin.com (gk-fr3.michelin.com [141.194.8.236])
by mx.kundenserver.de (node=mxeu3) with ESMTP (Nemesis)
id 0Lhwqk-1UVrcZ24JO-00nL0h for<never you mind!>; Tue, 25 Jun 2013 17:16:17 +0200
X-AuditID: 8dc208e5-b7f866d000002d39-77-51c9a8fa6fed
Received: from carlx663-out.mia.michelin.com (Unknown_Domain [141.194.8.213])
by gk-fr3.michelin.com (Service ready) with SMTP id 2C.FB.11577.AF8A9C15; Tue, 25 Jun 2013 16:28:10 +0200 (CEST)
Received: from carlx663-out.mia.michelin.com (carlx663-out.michelin.com [141.194.8.213])
by carlx663-out.mia.michelin.com (Postfix) with ESMTP id 760B983D9D
for <<never you mind!>>; Tue, 25 Jun 2013 16:00:58 +0200 (CEST)
Received: from carlx663-mil.mia.michelin.com (localhost [127.0.0.1])
by localhost (Postfix) with ESMTP id 655E483DDB
for <<never you mind!>>; Tue, 25 Jun 2013 16:00:58 +0200 (CEST)
Received: from carlx663-out.mia.michelin.com (localhost [127.0.0.1])
by carlx663-mil.mia.michelin.com (Postfix) with SMTP id 580FC83D9D
for <<never you mind!>>; Tue, 25 Jun 2013 16:00:58 +0200 (CEST)
Received: from mi1nh001.mia.michelin.com (unknown [10.139.79.54])
by carlx663-out.mia.michelin.com (Postfix) with ESMTP id 24E5683DC8
for <<never you mind!>>; Tue, 25 Jun 2013 16:00:58 +0200 (CEST)
To: <never you mind!>
Cc: <never you mind!>@uk.michelin.com
MIME-Version: 1.0
Subject: Fw:<never you mind!>
X-KeepSent: B2CC3ABC:6D734039-80257B95:004C59FC;
type=4; name=$KeepSent
X-Mailer: Lotus Notes Release 8.5.2FP2 March 23, 2011
From:<never you mind!>@uk.michelin.com
Message-ID: <OFB2CC3ABC.6D734039-ON80257B95.004C59FC-80257B95.004CFDB8@michelin.com>
Date: Tue, 25 Jun 2013 15:00:57 +0100
Return-Receipt-To: <never you mind!>@uk.michelin.com
Content-Type: multipart/alternative; boundary="=_alternative 004CFD5580257B95_="
HBRP: pmx-out.michelin.com
Gmail for example:
https://support.google.com/mail/answer/29436?hl=enAnd iOS:
https://www.youtube.com/watch?v=0L4ZnxX10kM