I started this thread some time ago and got to the point where I was able to trace things to Postfix and ultimately found where the message was apparently sent to my ISP.
May 5 06:34:41 dap002 postfix/smtpd[3674]: connect from dap002[127.0.0.1] May 5 06:34:41 dap002 postfix/smtpd[3674]: E904B2001: client=dap002[127.0.0.1] May 5 06:34:41 dap002 postfix/cleanup[3677]: E904B2001: message-id=<mailman.0.1304591680.3673.mail...@bellsouth.net> May 5 06:34:41 dap002 postfix/qmgr[2599]: E904B2001: from=<mailman-boun...@bellsouth.net>, size=1833, nrcpt=1 (queue active) May 5 06:34:41 dap002 postfix/smtpd[3674]: disconnect from dap002[127.0.0.1] May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 220 isp.att.net - Maillennium ESMTP/MULTIBOX frfwmhc04 #3 May 5 06:34:42 dap002 postfix/smtp[3678]: > mail.bellsouth.net[204.127.217.17]:25: EHLO home.bellsouth.net May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250-isp.att.net May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250-7BIT May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250-8BITMIME May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250-DSN May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250-HELP May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250-NOOP May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250-PIPELINING May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250-SIZE 26214400 May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250-VERS V05.40c++ May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250 XMVP 2 May 5 06:34:42 dap002 postfix/smtp[3678]: server features: 0x900f size 26214400 May 5 06:34:42 dap002 postfix/smtp[3678]: Using ESMTP PIPELINING, TCP send buffer size is 4096 May 5 06:34:42 dap002 postfix/smtp[3678]: > mail.bellsouth.net[204.127.217.17]:25: MAIL FROM:<mailman-boun...@bellsouth.net> SIZE=1833 May 5 06:34:42 dap002 postfix/smtp[3678]: > mail.bellsouth.net[204.127.217.17]:25: RCPT TO:<d...@bellsouth.net> ORCPT=rfc822;d...@bellsouth.net May 5 06:34:42 dap002 postfix/smtp[3678]: > mail.bellsouth.net[204.127.217.17]:25: DATA May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250 ok May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250 ok May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 354 ok May 5 06:34:42 dap002 postfix/smtp[3678]: > mail.bellsouth.net[204.127.217.17]:25: . May 5 06:34:42 dap002 postfix/smtp[3678]: > mail.bellsouth.net[204.127.217.17]:25: QUIT May 5 06:34:42 dap002 postfix/smtp[3678]: < mail.bellsouth.net[204.127.217.17]:25: 250 ok ; id=20110505103442H040014q56e May 5 06:34:42 dap002 postfix/smtp[3678]: E904B2001: to=<d...@bellsouth.net>, relay=mail.bellsouth.net[204.127.217.17]:25, delay=1, delays=0.05/0.06/0.61/0.3, dsn=2.0.0, status=sent (250 ok ; id=20110505103442H040014q56e) May 5 06:34:42 dap002 postfix/smtp[3678]: name_mask: resource May 5 06:34:42 dap002 postfix/smtp[3678]: name_mask: software May 5 06:34:42 dap002 postfix/qmgr[2599]: E904B2001: removed As you can see, it appears everything is working properly as far as Postfix is concerned. However, my ISP never delivers the email to the recipient. All other mail to/from my mailing lists work and are successfully delivered including welcome messages, etc. This means to me (unless someone can think of something else) that the reason my ISP is not delivering the mail is because it is finding something unique in this particular email that does not exist in all others. There is no bounced message from the ISP so it must be throwing it into the bit bucket for some reason and I am not getting even a hint as to what is wrong. Can someone think of what is unique about these messages from all the others mailman generates? I doubt it is anything in the body so it seems it has to be something in the headers. The only straw I can grasp is perhaps the from address. 'Mailman-bounces' does not exist but is that not the from address of all mailman generated messages? Thanks.
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