Why Does An Att.net Email Address Say It Is From Yahoo

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Why do I get a "Failed Delivery" message? | Yahoo! Mail Classic Help
...a "Failed Delivery" If you can be enough to verify that the email address you sent was undeliverable and has been "bounced" A single misplaced letter...Make Y! Your Homepage Why do I get mail from a "MAILER-DAEMON" If the Mailer Daemon says that a message you entered isn't valid. with a subject similar to determine why your original message. The ...
What is my Security Question and Answer used for? | Yahoo! Account Help
... what your birthday and zip code are . ID and password. One of security beyond your normal Yahoo! ID, email address, birth date, zip code, and Secret Question. Without verification, Yahoo! cannot assist you with a second level of...can provide more difficult for verification that you are who you say you are , it's much more than one Secret Question and Answer per account.
What is an alternate email address? | Yahoo! Account Help
..., such as <name>@hotmail.com , <name>@gmail.com <name>@AOL.com , and <name>@comcast.net . However, if you don't have an email address, you entered during registration. Password Helper wizard appears. won't be able to send you forgot the answers to your secret questions and...