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how do i set up a filter when the sender is blank

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I am receiving junk emails where the 'From' column is a blank. How can I set up a filter to block these. The 'Subject' column varies with each email.

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I am receiving junk emails where the 'From' column is a blank. How can I set up a filter to block these. The 'Subject' column varies with each email. Thanks for taking the time to read this question.

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click on them as junk.. the junk filter will catch on. Mine took a long while for truly odd junk like that, but it got there.

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click on them as junk.. the junk filter will catch on. Mine took a long while for truly odd junk like that, but it got there.