Odd issue: Email sent to empty groups went to others not even listed on the email

Redacted but these "Groups" were the only ones intended to receive the info BUT only 1 group had people in it others were empty, yet so many outside these groups got the email (all internal people).  Now since I have rebuilt the groups, but all looked well so from this I cannot see HOW the email could have gone ANYWHERE but to the intended recipients.

Header Name      Header Value
Content-Type      application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding      binary
From      Person>  
To      _Grp <Grp@>,  Managers <Managers@>,  <Corporate@>
Subject       Closing Report 10/19/15
Thread-Topic Closing Report 10/19/15
Thread-Index      AQHRC2teLxMQnPlDB0aLJWYqpXCExw==
Date      Tue, 20 Oct 2015 12:14:43 -0700
Message-ID      <xxxx@xxxxx.com>
Accept-Language      en-US
Content-Language      en-US
X-MS-Exchange-Organization-SCL      -1
X-MS-TNEF-Correlator      <xxxxx@xxxx.com>
MIME-Version      1.0
X-MS-Exchange-Transport-FromEntityHeader      Hosted
X-MS-Exchange-Organization-MessageDirectionality      Originating
X-MS-Exchange-Organization-AuthSource      -exch.xxx.local
X-MS-Exchange-Organization-AuthAs      Internal
X-MS-Exchange-Organization-AuthMechanism      04
X-Originating-IP      [24.120.100.9]
X-MS-Exchange-Organization-Network-Message-Id      f4036238-3091-4cf3-fedc-08d2d982b620
Return-Path      xxx@xxxx.com
X-KSE-AntiSpam-Interceptor-Info      internally-submitted e-mail
X-MS-Exchange-Organization-AVStamp-Enterprise      1.0
X-MS-Exchange-Organization-AVStamp-Mailbox      KasprLab;24545;0;0
X-KSE-ServerInfo      -exch01.xxxx.local, 9
X-KSE-Antivirus-Interceptor-Info      scan successful
X-KSE-Antivirus-Info      Clean
X-Auto-Response-Suppress      DR, OOF, AutoReply
stingcctvAsked:
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jcimarronCommented:
stingcctv--
Have you looked at the header of the Sent email.  What recipient addresses are shown?  Perhaps you were using a template which included the unwanted recipients.

"Now since I have rebuilt the groups"--does that mean you have fixed the problem?  If so it will be hard to "fix" the earlier problem.

winmail.dat  suggests you are sending in Rich Text , but I cannot see that would affect who gets the email.
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stingcctvAuthor Commented:
Yes that is the header with the redacted info there are (3) groups total (2) with no people in them. The person just sent a msg before anyone was in it lol .  Yes the rebuild fixed it,  I was just curious as to how the heck that could have happened because recipients that got it didn't exist (in those groups) and no  template used just created the group from scratch with intention of adding the people.  Had to rebuild because of necessity wonders never cease...
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jcimarronCommented:
stingcctv --
I feel I wasted my time responding to your thread.
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stingcctvAuthor Commented:
No resolution needed a rebuild fixed the issue.  What happened was quite peculiar.
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