Spam
I am a Mail Pro user and started receive too many spam in my inbox last few months in 2018. Please update the SPAM filtering.
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This help page explains how to block or unblock email addresses in New Mail:
https://help.yahoo.com/kb/sln28140.html
You can also manage spam using this information:
https://help.yahoo.com/kb/sln28056.html
Thank you!
Mail Support