https://bugs.exim.org/show_bug.cgi?id=17

--- Comment #3 from Jeremy Harris <[email protected]> ---
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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