Since my account was hacked on December 24, I have received a trickle of mail from habitual senders, Strong PW changed. Unable to send.
Very poor performance by Yahoo Help.

Hi there,
Could you please message us on Twitter at @YahooCare or on Facebook at Yahoo Customer Care? We'd like to look more into the issue you're experiencing. In case you do not have a social media account, we are also available at: help.yahoo.com
Looking forward to your reply!
Thank you,
Yahoo Mail team
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Jaime Bordes commented
It is very frustrating to obtain NO HELP AT ALL from Yahoo regarding this issue. A trickle of incoming mail, no send, and absolutely no help from Yahoo. Original 14-character password changed immediately after December 24 hack. Since then, my contacts and others receive extraneous mail from " my " address that I never sent.
Hack reported immediately, with no action whatsoever by yahoomail.