Currently Being ModeratedNov 14, 2012 9:57 AM (in response to Weep Unto Oblivion)
There's no way the logs won't show where the message is coming from - it may just be you're looking in the wrong place.
If you look at the log messages you posted you'll see the delay= section. This tells you how long the message has been in the queue (in seconds), so in the case of:
ov 14 13:00:21 companydomainname postfix/smtp: 379D511B502B6: to=<firstname.lastname@example.org>, relay=outbound.maildistiller.com[220.127.116.11]:25, delay=1202, delays=896/4.6/301/0.66, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 07A5E80037)
You need to look back in the log about 20 minutes to find where the message came from.
You can also look at the actual message spool file on disk for anymessage still in the queue. In the case of:
Nov 14 13:00:18 companydomainname postfix/smtp: 0088C11B502BF: conversation with outbound.maildistiller.com[18.104.22.168] timed out while sending MAIL FROM
Look for the file '0088C11B502BF' somewhere within the /var/spool/postfix directory. It will contain the mail headers, including the originating host's IP address.