If your email is blaklisted by Yahoo, users will receive the following bounced back message.
Bounced Back Message:
421 4.7.0 [TS01] Messages from <0.0.0.0> temporarily deferred due to user complaints -
<0.0.0.0> ; see http://postmaster.yahoo.com/421-ts01.html
First find out the cause and resolved the matter.
Then visit the link below to request for removal from blacklist by Yahoo.
http://help.yahoo.com/l/us/yahoo/mail/postmaster/bulkv2.html
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