Yahoo doesn't tell us what causes it, but does say anyone getting it needs to contact them to resolve it, and specifies some information they want for at least one of the emails that results in this error message. Go here for instructions on how and where to report it:
I discovered a much more detailed answer, with additional steps you might take, that was provided by a more knowledgeable answerer here. I recommend it to you.
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Verified answer
Yahoo doesn't tell us what causes it, but does say anyone getting it needs to contact them to resolve it, and specifies some information they want for at least one of the emails that results in this error message. Go here for instructions on how and where to report it:
Problem loading message: Error Code 45
http://help.yahoo.com/kb/index?page=content&y=PROD...
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I discovered a much more detailed answer, with additional steps you might take, that was provided by a more knowledgeable answerer here. I recommend it to you.
http://answers.yahoo.com/question/index;_ylt=AqKUi...