Is there any documentation of how SMTPDirect is supposed to work?
I am not being sarcastic when I suggest reading the code in $prefix/Mailman/Handlers/SMTPDirect.py
SMTPDirect depends on the standard Python module smtplib and, bearing in mind your earlier post about an SMTP problem (Subject: Outbound mail getting stuck), you could take a look at the Python documentation of it, particularly the worked example of smtplib use that is here:
http://www.python.org/doc/current/lib/SMTP-example.html
Regarding that earlier post, I would suggest that given the SMTP server refused the connection, you should look at that server end. Such a refusal is probably due to there being no SMTP server listening on interface/port that you have specified using the SMTPHOST/SMTPPORT MM config variables: see $prefix/Defaults.py for comments on these. Such failure is usually due to the way the SMTP server (MTA) has been configured and are not a Mailman problem per se. The 'connection refused' error text reflects what the underlying Pyython socket module has returned to smtplib when it was unable to open a TCP connection to the SMTP server on behalf of the smtplib code.
Your problem may be just that your local SMTP server is not configured to accept incoming connections on the default of 'localhost' port 25
You could explore connecting to that SMTP server using the smtplib example while running Python from the command line and see if that generates a refusal. If that works OK then SMTPDirect is usually good to go.
And can anyone suggest how I trace what is happening when it is invoked?
Personally, I tend to hack in a few calls to syslog to the code that output information that may enlighten me as to what is going on, e.g.
syslog('error', 'my diagnosic info, value was: %s', somevariableoranother)
Making sure that his import has been done somewhere above in the source:
from Mailman.Logging.Syslog import syslog
-- John
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