Check your spam/sanity filters. Looking at the headers of the two e-mails you have:
Received: from micaeked.com (micaeked.com [127.0.0.1])
.by micaeked.com (Postfix) with ESMTP id 117A390279
.for <19162188541@tmomail.net>; Sun, 8 Aug 2010 15:33:10 -0700 (PDT)
Received: (from micaeked@localhost)
.by micaeked.com (8.14.4/8.14.4/Submit) id o78MX9YA026943
.for 19162188541@tmomail.net; Sun, 8 Aug 2010 15:33:09 -0700
From: micaeked@micaeked.com
Message-Id: <201008082233.o78MX9YA026943@micaeked.com>
Date: Sun, 08 Aug 2010 15:33:09 -0700
To: 19162188541@tmomail.net
Subject: EURGBP
User-Agent: Heirloom mailx 12.4 7/29/08
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
vs
Received: from macbook-PC (adsl-75-45-9-58.dsl.scrm01.sbcglobal.net [75.45.9.58])
.by micaeked.com (Postfix) with ESMTPA id 1DAF390279
.for <19162188541@tmomail.net>; Sun, 8 Aug 2010 15:41:28 -0700 (PDT)
From: "Max Matush" <maxmatush@micaeked.com>
To: "Mica Eked" <19162188541@tmomail.net>
Subject: USDCHF
Content-Type: text/plain;
Content-Transfer-Encoding: 8bit
The missing required headers (Message-ID, Date) is the most likely reason your e-mail is dropped by the server. What does it say in the server logs?