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Yahoo email addressesbounced back emails with yahoo.com addresses

I run a family business as well as a non-profit organization. Over the past 4 years I have sent several messages (and some mass emails 100-150) to various customers/clients with a yahoo.com address. In the past 2 days I have gotten all emails sent to customers/clients with yahoo.com addresses bounced back to me. This is the message that I am getting: Server response to MAIL FROM:
421 4.7.0 [TSS04] Messages from 216.235.172.45 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html
Would you please let me know why this is happening and how we can get it fixed?

Ju
Jan 12, 2017

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