All the test messages sent by the mailhost routine are being aborted. See mail server log below:
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Tue 2004-03-23 23:51:13: [404:2930:1] Accepting SMTP connection from [206.14.107.103 : 4048]
Tue 2004-03-23 23:51:13: [404:2930:1] --> 220-mail.vets-internet.com ESMTP MDaemon 6.8.5; Tue, 23 Mar 2004 23:51:13 -0800
Tue 2004-03-23 23:51:13: [404:2930:1] --> 220-- This is a private server and not for public use.
Tue 2004-03-23 23:51:13: [404:2930:1] --> 220 Violations will be reported.
Tue 2004-03-23 23:51:13: [404:2930:1] <-- HELO spamcop.net
Tue 2004-03-23 23:51:13: [404:2930:1] --> 250 mail.vets-internet.com Hello spamcop.net, pleased to meet you
Tue 2004-03-23 23:51:13: [404:2930:1] <-- mail from: <service[at]admin.spamcop.net>
Tue 2004-03-23 23:51:13: [404:2930:1] Spam Blocker is checking 206.14.107.103 (connecting IP)
Tue 2004-03-23 23:51:13: [404:2930:1] * bl.spamcop.net - passed
Tue 2004-03-23 23:51:13: [404:2930:1] * relays.ordb.org - passed
Tue 2004-03-23 23:51:13: [404:2930:1] * dnsbl.sorbs.net - passed
Tue 2004-03-23 23:51:13: [404:2930:1] Spam Blocker is finished
Tue 2004-03-23 23:51:13: [404:2930:1] --> 250 <service[at]admin.spamcop.net>, Sender ok
Tue 2004-03-23 23:51:13: [404:2930:1] <-- rcpt to: <sales[at]vets-internet.com>
Tue 2004-03-23 23:51:13: [404:2930:1] --> 250 <sales[at]vets-internet.com>, Recipient ok
Tue 2004-03-23 23:51:14: [404:2930:1] <-- data
Tue 2004-03-23 23:51:14: [404:2930:1] --> 354 Enter mail, end with <CRLF>.<CRLF>
Tue 2004-03-23 23:51:14: [404:2930:1] Socket connection closed by the other side (how rude!)
Tue 2004-03-23 23:51:14: [404:2930:1] SMTP session abnormally terminated, 0 bytes transferred.
Tue 2004-03-23 23:51:14: ----------
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Chris