FEATURE(promiscuous_relay)
Allow unbridled relaying V8.9 and later
The relaying of outside mail through your site to
another outside site is turned off by default. But
if you want to allow this old and dangerous
behavior, declare this FEATURE(promiscuous_relay). This
feature, how it is used, and how it fits into
relaying and spam handling in general are explained
in FEATURE(promiscuous_relay) on page 271.
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