Chkuser 2.0
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chkusr 1.0

chkuser 2.0 - enabling

chkuser will check for recipients only if it is requested to do so.

With standard settings, chkuser check recipients if recipient's domain has bouncing enabled.

Standard bouncing may be set for each domain using qmailadmin, or manually using a .qmail-default like this one:

| /vpopmail/bin/vdelivermail '' bounce-no-mailbox

If you have a not standard installation, or checking must be done with different criterias, see the settings page for the additional #define available, or look inside FAQs for more explanations.