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Connection lost to smtp server

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I have Astaro 8.30o running on a Vmware ESXi 4.x hypervisor.
I have a mail server running on another VM: Zimbra.

When sending mail from my cell phone I get a strange connection lost with associated errors on the client.

2012:02:28-12:41:28 wahine exim-in[12076]: 2012-02-28 12:41:28 SMTP connection from [107.63.xx.yy]:34866 (TCP/IP connection count = 1)
2012:02:28-12:41:28 wahine exim-in[17467]: 2012-02-28 12:41:28 SMTP connection from [107.63.xx.yy]:34866 lost
2012:02:28-12:41:28 wahine exim-in[12076]: 2012-02-28 12:41:28 SMTP connection from [107.63.xx.yy]:35189 (TCP/IP connection count = 1)
2012:02:28-12:41:29 wahine exim-in[17468]: 2012-02-28 12:41:29 SMTP connection from [107.63.xx.yy]:35189 lost
2012:02:28-12:41:29 wahine exim-in[12076]: 2012-02-28 12:41:29 SMTP connection from [107.63.xx.yy]:40898 (TCP/IP connection count = 1)
2012:02:28-12:41:29 wahine exim-in[17469]: 2012-02-28 12:41:29 SMTP connection from [107.63.xx.yy]:40898 lost
2012:02:28-12:41:41 wahine exim-in[12076]: 2012-02-28 12:41:41 SMTP connection from [107.63.xx.yy]:35720 (TCP/IP connection count = 1)
2012:02:28-12:41:41 wahine exim-in[17472]: 2012-02-28 12:41:41 SMTP connection from [107.63.xx.yy]:35720 lost
2012:02:28-12:41:41 wahine exim-in[12076]: 2012-02-28 12:41:41 SMTP connection from [107.63.xx.yy]:43486 (TCP/IP connection count = 1)
2012:02:28-12:41:42 wahine exim-in[17473]: 2012-02-28 12:41:42 SMTP connection from [107.63.xx.yy]:43486 lost
2012:02:28-12:41:42 wahine exim-in[12076]: 2012-02-28 12:41:42 SMTP connection from [107.63.xx.yy]:59239 (TCP/IP connection count = 1)
2012:02:28-12:41:42 wahine exim-in[17474]: 2012-02-28 12:41:42 SMTP connection from [107.63.xx.yy]:59239 lost

I see nothing from the firewall logs.
Connections work fine from a local [inside the firewall] network.
HTML interface to the server works fine. [not a serious part of the troubleshooting]

I have the Zimbra vm lised in the host list under Mail Security \ SMTP section,
and I have Authenticated Relaying allowed.

Can anyone think of a Astaro-sourced cause of this problem?
I'm looking at Zimbra as well but can't think of a reason for the issue.

Thanks,
Doug

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