mailer daemon / cannot send reply
I have begun receiving mailer daemon errors when trying to reply to an email from a friend.The mailer daemon email reads, "Error code 475: Suspicious activity was detected on your account." This is completely unacceptable. I am the one sending the replies and I know all parties I am sending the replies to. If I am unable to reply to emails then that renders my yahoo account literally unusable. If I receive an important email I need to be able to reply.

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& SantAngelo commented
Im gettting message can not send
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Dickeys BBQ PIT commented
I hate this freaking notification!!!! Never ever have this problem with Gmail!!!!!
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Muhammad Azmi commented
inbox eror
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Richard John LeBoeuf commented
It's happening to me too. Work e-mails getting sent back. Really frustrating and intolerable.