More on relay problem, something to do with tcpserver

[Boz Crowther]

Ok, by checking the logs I've determined that from certain clients (namely a command-line DOS smtp mailer we use) the smtp connection ends before getting any data, with the following message in /var/log/qmail/qmail-smtpd/current:   tcpserver: end xxx status 256   When using Outlook Express, which is successful, this message winds up in the log:   tcpserver: end xxx status 0   Simple question: where can I find out what the end statuses provided by tcpserver mean?   TIA