[qmailtoaster] SENDER_NOCHECK="1"

[Dan Herbon]

So out of nowhere people sending email on their blackberries started getting
the "5.1.0 - Unknown address error 571-'sorry, sender address has invalid
format (#5.7.1 - chkuser)'" errors. I located the fix on the toaster wiki
which basically says to add in SENDER_NOCHECK="1". Does adding this
compromise security? What will its affects be?