[Mailman-Users] Mail Processing Problem?

[Dennis Putnam]

Thanks for the reply. I have a guess as to what is wrong but I don't 
know how to fix it in mailman. Here are the syslog entries for a 
non-mailman email:

Jan 12 10:55:10 dap002 postfix/qmgr[2345]: 47CD185063: 
from=<dap at home.bellsouth.net>, size=435, nrcpt=1 (queue active)
Jan 12 10:55:16 dap002 postfix/smtp[21572]: 47CD185063: 
to=<dap1 at bellsouth.net>, relay=mail.bellsouth.net[204.127.217.17]:25, 
delay=5.8, delays=0.05/0.02/5.5/0.28, dsn=2.0.0, status=sent (250 ok 
; id=20080112155515H0100n202se)
Jan 12 10:55:16 dap002 postfix/qmgr[2345]: 47CD185063: removed

Note the from hostname is 'home.bellsouth.net'. Now the mailman entries:

Jan 12 10:56:12 dap002 postfix/qmgr[2345]: D4F7D85061: 
from=<cufsalumni-bounces at dap002.bellsouth.net>, size=10015, nrcpt=1 
(queue active)
Jan 12 10:56:12 dap002 postfix/smtpd[21582]: disconnect from dap002[127.0.0.1]
Jan 12 10:56:16 dap002 postfix/smtp[21572]: D4F7D85061: 
to=<dap1 at bellsouth.net>, relay=mail.bellsouth.net[207.115.11.17]:25, 
delay=3.5, delays=0.03/0.01/3.3/0.19, dsn=5.0.0, status=bounced (host 
mail.bellsouth.net[207.115.11.17] said: 550 [PERMFAIL] bellsouth.net 
requires valid sender domain (in reply to RCPT TO command))

Here the from hostname is 'dap002.bellsouth.net' instead of 
'home.bellsouth.net', that is not to say I know this is the problem 
but its all I can see as different. Obviously mailman is somehow 
overriding the normal from hostname and building its own. The name 
'dap002' is the LAN hostname but I cannot use that as the from 
address to my ISP. My ISP has a special hostname for situations like 
this that will properly resolve via DNS although it is a dummy name 
for all DHCP assigned IPs. My mm_cfg.py has these 2 lines referring 
to the hostname but obviously they are not what is being used in this case:

DEFAULT_EMAIL_HOST = 'home.bellsouth.net'
DEFAULT_URL_HOST = 'home.bellsouth.net'