Mail Queue All stuffed up… Help!

[Bill]

All of a sudden, our Mac OS X Server 10.4.2. has stopped sending (both externally and internally) as well and delivering mail.

The mail is apparently in the queue, as reported by the Server Admin tool, so incoming mail is there as well as outgoing.

Here is a snippet of mail.log that is representative of the issue… any thoughts or suggestions?

Mar 14 11:38:51 mx1 postfix/smtpd[769]: disconnect from mail4.opencottage.com[216.66.53.55]
Mar 14 11:39:19 mx1 postfix/smtpd[721]: connect from fe-3c.inet.it[213.92.5.106]
Mar 14 11:39:22 mx1 postfix/smtpd[721]: 375D71B9265E: client=fe-3c.inet.it[213.92.5.106]
Mar 14 11:39:22 mx1 postfix/cleanup[793]: 375D71B9265E: message-id=<[email protected]>
Mar 14 11:39:23 mx1 postfix/qmgr[658]: 375D71B9265E: from=, size=4712, nrcpt=1 (queue active)
Mar 14 11:39:23 mx1 postfix/qmgr[658]: 375D71B9265E: to=, relay=none, delay=4, status=deferred (delivery temporarily suspended: connect to 127.0.0.1[127.0.0.1]: Connection refused)
Mar 14 11:39:25 mx1 postfix/smtpd[974]: connect from dhtlmn31.agency.hq[192.168.0.198]
Mar 14 11:39:26 mx1 postfix/smtpd[974]: 0DFDC1B92660: client=dhtlmn31.agency.hq[192.168.0.198], sasl_method=LOGIN, sasl_username=chuck_southworth
Mar 14 11:39:26 mx1 postfix/cleanup[936]: 0DFDC1B92660: message-id=<[email protected]>
Mar 14 11:39:26 mx1 postfix/smtpd[769]: connect from mx1.p.bulldogreporter2.com[216.70.54.120]
Mar 14 11:39:27 mx1 postfix/qmgr[658]: 0DFDC1B92660: from=, size=34473, nrcpt=1 (queue active)
Mar 14 11:39:27 mx1 postfix/qmgr[658]: 0DFDC1B92660: to=, relay=none, delay=2, status=deferred (delivery temporarily suspended: connect to 127.0.0.1[127.0.0.1]: Connection refused)
Mar 14 11:39:27 mx1 postfix/smtpd[769]: 7EABA1B92665: client=mx1.p.bulldogreporter2.com[216.70.54.120]
Mar 14 11:39:27 mx1 postfix/cleanup[900]: 7EABA1B92665: message-id=<[email protected]>
Mar 14 11:39:28 mx1 postfix/smtpd[769]: disconnect from mx1.p.bulldogreporter2.com[216.70.54.120]
Mar 14 11:39:28 mx1 postfix/qmgr[658]: 7EABA1B92665: from=, size=10680, nrcpt=1 (queue active)
Mar 14 11:39:28 mx1 postfix/qmgr[658]: 7EABA1B92665: to=, relay=none, delay=1, status=deferred (delivery temporarily suspended: connect to 127.0.0.1[127.0.0.1]: Connection refused)

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