Noticed the above error over the last few days and would like to resolve it:

I can send email out from our zimbra internal server but cannot accept mail as the user mail account is shown
as non existent.

How can this be corrected?

Logs below:

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 No Such User Here (state 13).

MIME-Version: 1.0
Received: by 10.68.143.201 with SMTP id sg9mr4012306pbb.32.1352212177022; Tue,
06 Nov 2012 06:29:37 -0800 (PST)
Received: by 10.68.57.5 with HTTP; Tue, 6 Nov 2012 06:29:36 -0800 (PST)
In-Reply-To: <CABtjk8kbZQReKVrQ_Xf3X2bpdDrmUaOfBV3Q-RziMKprbVWWEg@mail.gmail.com>
References: <CABtjk8kbZQReKVrQ_Xf3X2bpdDrmUaOfBV3Q-RziMKprbVWWEg@mail.gmail.com>
Date: Tue, 6 Nov 2012 14:29:36 +0000
Message-ID: <CABtjk8nEGS93xRvGK-6=Z=B6uf2KbMe9=JfaUiC-R=UzJP+ewg@mail.gmail.com>
Subject: Re: mail test
From: joe bloggs <joebloggs@gmail.com>
To: jmac@jum.ie
Content-Type: multipart/alternative; boundary=047d7b2e42ac78f02204cdd46ef9

Nov 6 14:30:51 srv1 postfix/qmgr[6430]: 62A515C02AD: from=<jmac@jum.ie>, size=15017, nrcpt=1 (queue active)
Nov 6 14:30:51 srv1 postfix/smtpd[7777]: disconnect from srv2.jum.ie[192.168.10.109]
Nov 6 14:30:51 srv1 amavis[6152]: (06152-01) ESMTP::10024 /opt/zimbra/data/amavisd/tmp/amavis-20121106T143051-06152: <jmac@jum.ie> -> <joebloggs@gmail.com> SIZE=15017 Received: from srv1.jum.ie ([127.0.0.1]) by localhost (srv1.jum.ie [127.0.0.1]) (amavisd-new, port 10024) with ESMTP for <joebloggs@gmail.com>; Tue, 6 Nov 2012 14:30:51 +0000 (UTC)
Nov 6 14:30:51 srv1 amavis[6152]: (06152-01) Checking: lC9qkjqHa3JY MYNETS [192.168.10.109] <jmac@jum.ie> -> <joebloggs@gmail.com>
Nov 6 14:30:53 srv1 postfix/smtpd[8949]: connect from localhost.localdomain[127.0.0.1]
Nov 6 14:30:53 srv1 postfix/smtpd[8949]: A8C525C02A1: client=localhost.localdomain[127.0.0.1]
Nov 6 14:30:53 srv1 postfix/cleanup[7781]: A8C525C02A1: message-id=<26171346.22.1352212251259.JavaMail.root@srv1>
Nov 6 14:30:53 srv1 postfix/qmgr[6430]: A8C525C02A1: from=<jmac@jum.ie>, size=15507, nrcpt=1 (queue active)
Nov 6 14:30:53 srv1 amavis[6152]: (06152-01) FWD via SMTP: <jmac@jum.ie> -> <joebloggs@gmail.com>,BODY=7BIT 250 2.0.0 from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as A8C525C02A1
Nov 6 14:30:53 srv1 amavis[6152]: (06152-01) Passed CLEAN, MYNETS LOCAL [192.168.10.109] [192.168.10.109] <jmac@jum.ie> -> <joebloggs@gmail.com>, Message-ID: <26171346.22.1352212251259.JavaMail.root@srv1>, mail_id: lC9qkjqHa3JY, Hits: -2.909, size: 15015, queued_as: A8C525C02A1, 2294 ms
Nov 6 14:30:53 srv1 postfix/smtp[7782]: 62A515C02AD: to=<joebloggs@gmail.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=2.3, delays=0.02/0/0.01/2.3, dsn=2.0.0, status=sent (250 2.0.0 from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as A8C525C02A1)
Nov 6 14:30:53 srv1 postfix/qmgr[6430]: 62A515C02AD: removed