The setup and transfer of other emails is too complicated.
My cable company decided that they were going to use yahoo mail for our email accounts now, so had no choice but to use it. It is too complicated in setting up my email accounts with yahoo, it should just automatically transfer since they are taking over our email accounts. I used to have my own yahoo account but got rid of it, due to viruses and hacks and nothing being done to fix it.
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If you're having account or sign-in issues, please contact our Customer Care team at help.yahoo.com. They are separate from the Yahoo Mail team. They resolve these types of issues and have the tools to help. Hope this helps. Thanks!