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Summary: SMTP backoff based on queue size
Under certain circumstances I find it would be useful to have Exim periodically
back off accepting SMTP connections based on the number of items in the mail
queue waiting to be processed by other discrete services in the system (ie
Whilst this is similar to the existing options such as:
to check storage usage
to check system load
these depend on the OS being able to report these details, in this case though
Exim itself can query its own queue length exim -bpc periodically which does
mean that control can be based on the number of items of mail rather than some
other arbitrary system resource.
where exim stops accepting mail at the high number, accepts mail again at the
low number, and checks the queue size at the appropriate interval. Whilst not
accepting email a temporary 4XX deferal series message should be issued so as
not to scare off upstream servers completely away.