https://bugs.exim.org/show_bug.cgi?id=17
--- Comment #3 from Jeremy Harris <jgh146exb@???> ---
There's several parts to this:
-How to detect the situation. If it's specifically defined as system memory
load, is there some way that is portable across platforms?
-How to define the parameter. (Mega)bytes used? Free? Percentage? Of RAM or
of RAM + swap?
-When, in the message processing sequence, to evaluate the condition.
As a condition to (or call-to-external-facility from) an ACL?
In a router (or transport)?
-How to configure the facility.
Ties into the previous (ACL or router placment), or
as a main-section option
-Action to take on detecting the overload.
ACL-configured probably has most flexibility; using that could do any of
- decline connection (a deny in the smtp_connect ACL)
- queue only (via ACL control=)
- divert delivery (via acl condition in a router)
and can be dependent on a reserved-host list
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