On Tue, 10 Jul 2012 19:29:47 +0000, Curtis Stevens <[log in to unmask]>
wrote:

>That is my thought as well.

Windows:

Add this line to site.cfg

SMTP_DEBUG=1 

Then stop/restart the LISTSERV service.  
------------
Unix:

add these 2 lines to go.user

SMTP_DEBUG=1
export SMTP_DEBUG

Then restart LISTSERV by doing   ./go bg  command in ~/listserv dir. 
------------------
Now the SMTPS#n logfile will show the full SMTP 'conversation' between
LISTSERV and whatever mail server.  This may shed useful light on the problem.
For example if Exchange admins upgraded from Exchange 2003 to 2007/2010 then
Exchange requires authenticated connections from remote SMTP servers (which
LISTSERV can't do).  There is a work around for that, but first find out more
what the problem actually is.

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