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qmail tcpto.8
qmail-tcpto - print TCP timeout table
qmail-tcpto
After an SMTP connection attempt times out, qmail-remote records the relevant IP address. If the same address fails again (after at least two minutes with no intervening successful connections - max_tolerance), qmail-remote assumes that further attempts will fail for at least another hour (min_backoff).
smtproutes can be used to control max_tolerance and min_backoff periods.
qmail-tcpto prints qmail-remote's current list of timeouts.
qmail-tcpto must be run either as root or with user id qmailr and group id qmail. qmail-tcpto uses the environment variable QUEUE_BASE or the conrol file qbase if present to use the queue base. If the environment variables QUEUE_START and QUEUE_COUNT are set, qmail-tcpto will process multiple queues present in the queue base.