My att yahoo e-mail has totally changed whats up cant send attachments or send out mail the format is also different

Yahoo Mail is a popular webmail service that allows people to create their own email username and have it hosted by the Yahoo network.
In addition to providing fast and reliable email, Yahoo Mail also allows you to send and receive large attachments.
If you use Yahoo Mail, and are having issues opening attachments, there are several easy troubleshooting steps you can try to get your Yahoo Mail attachments.
Sign out of Yahoo and clear your cache.
Since Yahoo! needs to access your cache to keep you logged in and to communicate with your computer when downloading attachments, a full cache can prevent Yahoo Mail from opening attachments correctly.
Go to your browser's "Tools" or "Internet Options" menu and then select the "Delete Temporary Internet files" command to delete your cache.
Reload the page.
lf you have had Yahoo Mail open for a long time, the page may have gone idle, and you may not be able to access your attachment.
Press the "Reload" (F5) button and then log back in to your account.
Ensure that the attachment is not corrupt.
If the sender did not finish uploading before they hit "Send" or there was an error during the upload, the file may be corrupted.
Ask the sender to re-attach the file and send it again.
Check the file format.
Some formats are proprietary and will not open unless specific programs are installed on your computer.
For instance, if you are sent an AAC file, you will not be able to open it unless iTunes is installed on your computer.

With the Web-based Yahoo! Mail service, you can attach to your email message a saved Web page or another document in HyperText Markup Language format.
When you attach an HTML file in this way, Yahoo! Mail won't display the HTML content of the attached file in the email message body.
To view the attachment, you must click the attachment tab above the email message.Yahoo! Mail and HTML
Yahoo! Mail is a Web-based service and it's fully compatible with the coding languages used to design and display Web content, including HTML and XML, Extensible Markup Language.
This means emails sent or received in Rich text or HTML format include clickable hyperlinks, graphics and other Web design elements.
However, Yahoo! handles emails with HTML attachments in a different way to email messages formatted with HTML.

About Yahoo! Mail Attachments
Like most email programs and online services, Yahoo! Mail offers an attachment feature for adding images, video clips, audio files and HTML document to email messages.
Some email programs display the content of the attached file in the email message body, but Yahoo! Mail doesn't provide this feature for any file attachment, whether it's an image, video clip or HTML document.


Viewing Yahoo! Mail Attachments When you attach an HTML document or another file to your Yahoo! Mail message, an "Attachments" button labeled with a "Paperclip" icon appears below the email address fields and above the email message body.
Clicking the "Attachments" button opens a pane containing a list of all files attached to the email. The email sender or recipient can open each attachment to view the files by clicking the file name.

Considerations

When sending a Yahoo! Mail with an attachment, always explain the content of the attachment in the main body of the email message.
A brief explanation will encourage the recipient to click and open the attachment to view the HTML document.
Bear in mind that many email services automatically block HTML attachments because of the security risk of opening HTML files, which can contain viruses, phishing scams or open Web pages with inappropriate content.
If you want to share a favorite Web page with a friend or contact, include a hyperlink to the Web page rather than a saved copy as an HTML attachment.

I'm wondering the same thing!! I keep getting an error message saying " Smart Tag Error: Malformed URL - ST_REJECTED_QUERY_STRING " when I send a message to someone! I don't even know yet if it's going through. My whole email page looks different now!! Didn't know if the format changed or it was some other problem. Hope somebody has an answer.

Yahoo Mail allows you to use one or more alternate sending addresses (which will appear in the "From:" line of messages that you send). To set that up, you need to change your mail settings.

On the Yahoo Mail page, go to: Options > Mail Options > Accounts
Then select "Add Account", and insert the new email address. (Yahoo will send a verification message to that address, to confirm that you are entitled to use it.) Be sure to click "Save changes" when you have finished.


After you set up and verify the new alternate sending address, you'll be able to select it from a pulldown menu, when sending a new message.

1. check here for the solution for Yahoo mail and the contact support number and there should be a live chat agent to assist you.
2. You issue is the setting for the smtp possibly or the authentication box checked.

ATT tech support & several web forums confirm that sending a SMS from your computer via an IM, (like Yahoo Messenger,etc.) to a PDA cellular is web based and requires a data plan. However, you can send a text message via email to cellular phones and receive replies. It is easy and just as fast. You have to know the recipients carrier to obtain the proper email address. For instance, to an ATT phone the address is: [email protected] Remember that most carriers have a character limit (ATT is 160).

See this link for a complete list of other carriers & email addresses- http://www.mydigitallife.info/2008/10/28/send-free-text-message-with-hundreds-of-email-to-sms-gateway-or-internet-web-sms-from-operator/

check your whitelist, the address your sending has been put to spam and blocked you from sending email.

Sure they can. But it will take some effort on your part. you will have to contact Yahoo and tell them of your problem, more than once or twice. When they start to reply and tell you the different ways to resolve your problem keep writing to them and save all the emails they send to you. this happened to me when someone hacked into my account and changed my passwords and e-mail address, I had to get a new e-mail so that I could send and resend all this information to them and the problem was resolved in 10 days of getting their e-mails telling me how to resolve it. good luck and be persistant!

u need to enable SSL in your email client