SMTP_DEBUG

This configuration variable enables logging of outgoing SMTP conversations with the outbound MTA for debugging purposes. This debugging setting should be used with great care as it can lead to the relevant logs becoming very large.

SMTP_DEBUG=1

Under Windows and OpenVMS, it is possible to log asynchronous or synchronous conversations (i.e., either with SMTP Workers defined or without them). Most sites today use asynchronous workers, that is, they have SMTP_FORWARD_n variables defined in the site configuration and the log files are generated in the LISTSERV log directory. Synchronous delivery occurs when SMTP_FORWARD_n is not defined and the delivery to the outbound MTA is accomplished by the main LISTSERV process. When synchronous delivery is used, output from SMTP debugging will appear in the LISTSERV console log.

Under Unix, because the child 'lsv' processes that handle asynchronous delivery are not able to write their own logs, it is necessary to drop back to synchronous delivery (i.e. comment out all SMTP_FORWARD_n variables to disable the workers) in order to use the SMTP debugging feature.



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