Document the virecover_enable knob. From the PR: 	Certain MTA configurations mean that the notifications from 	virecover keep bouncing; so here's a patch to allow administrators 	to turn them off.
Document the virecover_enable knob.
From the PR:
	Certain MTA configurations mean that the notifications from
	virecover keep bouncing; so here's a patch to allow administrators
	to turn them off.

PR:		conf/54910
Reminded by:	ru

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