Hi, How do folks monitor the health of their postfix installations?
log monitoring seems to be essential, rates of warning/error messages seem meaningful. Then there are the statistics regularly emitted, but these seem more indicative of busyness. Finally, monitoring queue sizes is probably advisable. Am I better off looking at the filesystem directly or using "postqueue -j"? postqueue offers additional details, but I'm wondering about the overhead over just looking at counts. Finally, what are the various queues? https://www.postfix.org/QSHAPE_README.html mentions maildrop, hold, incoming, active & deferred, but I also see bounce, corrupt, defer, flush, saved & trace under $queue_directory Thanks.
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