Doesn't work well
In the new Yahoo! Mail I cannot use italic and bold letters nor can I paste images.
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Draško Ešpek
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Have you tried general browser troubleshooting or a different browser? If not, please try these steps to fix this issue: help.yahoo.com/kb/sln2891.html
Also, if you want to send emails containing images, keep in mind that you will need to drag and drop those pictures in Yahoo mail.