attach other inbox emails to a new/reply email
Why can't we attach another email to a reply or brand new email? This is such an amazing and helpful feature of other email systems that I'm surprised it is not standard in Yahoo at this point.
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Jason Lienhardt
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Send messages that look like they’re coming from another one of your email addresses without leaving your New Mail account, info here: https://help.yahoo.com/kb/SLN28342.html