According to the man page, Net::SMTP debugging is sent to STDERR (see the parent class Net::Cmd documentation.) Since you're using Apache, the STDERR stream will go to the normal Apache error log file, perhaps /var/log/apache2/error.log.

If the above is not what you want, and you truly want to "capture" the output, for further processing by your script, you'll need to redirect STDERR to a file. The open function documentation shows how to save and restore STDERR.

In reply to Re: Capture Net:::SMTP debug output in a CGI script by gmargo
in thread Capture Net:::SMTP debug output in a CGI script by bgaber

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