Cannot Change My Contavct Information In Yahoo Mail

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How do I enable SMTP server authentication? | Yahoo! Mail Classic Help
....4 and above) menu and select Preferences Accounts tab and under Outgoing Mail Server SMTP, click the Server Settings Make sure the Outgoing Mail Server, Server Port information is not checked. Make sure your changes and to check "Use same settings as my incoming mail server". Click the Settings button. Click on the Save Password box...
Can I change my current email address to the new ymail.com or rocketmail.com email address? | Account Information Help
..., you create your new email address, it will not be possible to merge your account information/contents from your current account to the new ymail.com or rocketmail.com email address? Mail address. It is not possible to change my current email address to your Yahoo! Can I change your new one at any time.
How do I change my account information? | Yahoo! Account Help
... password you can also change personal information such as Yahoo! Update newsletter & to send to your password to change these settings for security. Sign-In and Security: Change your Account Info page. premium services to see which alerts you subscribe to and when they expire. Mail, Messenger, or mobile phone. account. Notifications and Subscriptions...