Mail delivery failed: returning message

Users sending emails to my homestead: gary@pixmarx.com  email get the following return email message!  

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

 gary_focustrain_if@pop.homestead.com
   (generated from gary@pixmarx.com)
   LMTP error after end of data: 552 5.2.2 <gary_focustrain_if@pop.homestead.com> Quota exceeded (mailbox for user is full)

------ This is a copy of the message's headers. ------

Return-path: <gary@focustrain.com>
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for gary@pixmarx.com; Wed, 22 Mar 2017 16:25:16 -0400
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       for <gary@pixmarx.com>
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       Wed, 22 Mar 2017 13:25:13 -0700 (PDT)
From: Gary Lipps <gary@focustrain.com>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Subject: test email
Message-Id: <9BB94329-327F-4B12-93C5-06C94F52C067@focustrain.com>
Date: Wed, 22 Mar 2017 15:25:12 -0500
To: "gary@pixmarx.com" <gary@pixmarx.com>
Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\))
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