[vchkpw] error codes

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Hi list,   I fooling around a little with the .qmail files and canīt get the error codes working. as much as i know, exit 99 should tell vdelivermail to stop wworking the mail, but apparently it doesnīt.   Is it a bug? Is the current version updated? Where can I find a list of exit/error codes?   Thanks - Ulrich