chkusr - Number
of email messages blocked because of invalid or non-existent To:,
CC: or BCC: email
addresses at domains hosted on this system. chkusr is
a patch to qmail-smtpd which checks whether or not the email address
an email message is being sent to exists or not. If the email address does
not exist it returns an
error to the sending system leaving it up to the sending system to notify
the sender.
sender domain -
Number of email messages with invalid or non-existent From: or
Return-Path: email
addresses. The domain of the sending user has to exists and has to accept
email so that
bounces can be received. If it does not exist the system will not accept
the email message and return an error to the sending system leaving it
up the sending system to notify the sender.
virus - Number
of email messages infected with virus.