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Many Internet Service Providers (ISP) or e-mail programs provide junk
e-mail filters that can serve as the first line of defense against spam.
Make sure your spam filters work the way you want. If your spam filter
is set at a very restrictive setting that weeds out as many suspect
messages as possible, it might be sending legitimate e-mail to the
electronic dump. Check your junk e-mail box regularly to make sure
that every message going there is truly junk, or loosen the restrictions.