Do not SPAM-filter emails from major known companies - allow whitelisting
Yahoo basic email's SPAM filter does a great job catching real SPAM - true junk seldom gets through. However, there seem to be many false positives, categorizing business emails from top-tier companies as SPAM: Microsoft, Adobe, ... When I repeatedly mark emails from these companies as "Not SPAM", those domains should be white-listed.
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Bob Hehmann
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