Ghost mail!!!

Hi, what can cause this problem?  When I try to send an accept from a calendar event created by a internal user "X", I'm receive the error about an internal user "Y", the user "Y" is not part of my address list today, she was excluded. The only relation is that user "Y" is a secretary of user "X" on the past.

Informações de diagnóstico para administradores:

Gerando servidor:
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

Cabeçalhos de mensagem originais:

Received: from ([172..x.y.z]) by
 ([172.x.y.w]) with mapi; Tue, 10 Jun 2008 10:12:50 -0300
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: =?utf-8?B?TWFyY29zIEFtw6lyaWNvIE1hcmluZWxsbyAoU0dJKQ==?=
To: "Mary Pop (SGE)"
Date: Tue, 10 Jun 2008 10:12:52 -0300
Subject: Aceita: TESTE.
Thread-Topic: TESTE.
Thread-Index: AcjK+jApp/0DTe7vQJGJSlV/NhsprwAAXiJw
Message-ID: <>
Accept-Language: pt-BR, en-US
Content-Language: pt-BR
X-MS-TNEF-Correlator: <>

Who is Participating?
robrandonConnect With a Mentor Commented:
Check the other users delegates.
Is user Y still on a mailing list / user group?
Is user Y still a delgate of user X's calendar?
MarinelloAuthor Commented:
No, user Y don't still on a mailling list / user group and don't still a delegate of user X's calendar.
MarinelloAuthor Commented:
I'm checked it and not found any delegate.
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