Email send problem on Yahoo and iPhone?

I can't get my email to send on my iPhone. I have a yahoo account with an @sbcglobal.net. This comes with my AT&T dsl service. When I set up the email account on the iPhone using the Add Account/YMail option everything works well and I can get validated. I can also receive mail. However I CANNOT send mail. The iPhone goes through the normal motions of sending and I hear the sound of mail being sent. However the mail is not actually sent. I've checked this with numerous email addresses and it just doesn't work.I've seen answers here where the suggestion is to make sure your name is entered exactly as it is listed on my Yahoo account. I've done that too and it still doesn't work.I can get it to work if I activate the account via the Add Account/Other option and enter in the pop and smtp mail servers. However, doing it this way does not allow push email.Does anyone know how to solve this problem?

I am having the same problem. I have had mine since it came out and the email worked fine (sending and receiving) until about two weeks ago. It started happening around the time that the latest update was installed. I went to the Apple Store and spoke to a "Genius" who was unable to help. He said it was a Yahoo! issue and that I needed to deal with them. Of course YAhoo! says it is an iPhone issue and I need to talk to them. Very frustrating! I have opened a regular Yahoo! account and am able to send mail now although it is inconvenient.I did notice that my email address on the iPhone now reads @sbcglobal.net where in the beginning it read @sbcglobal.net@yahoo.com. I can not get the @yahoo.com back on the end of the address. Maybe that has something to do with it. Sorry I couldn't help. I am just glad I am not the only one! Good luck!

I just saw this on another web site, but haven't tried it yet."I had the same problem with my sbcglobal.net email. I called apple and the tech guy told me to put smtp1.attglobal.net in the outgoing. Since then I have had no problems. He said that they specifically added this just for the iphone. Hopefully this helps!"

I do not know how to fix this either (sorry) I am having the same issue and wanted to know if you have figured it out. I went to the apple store spent about 12 hours on the phone with iphone help and am convinced this is not a problem with the phone since my email worked fine until ATT made some major changes to the web site arround July 31st. I have tried so many different combinations of settings my head is spinning. it has been 2 weeks now with no ability to send email from my iphone.