The response I got from Yahoo:
Thank you for writing to Yahoo! Mobile.
If I understood your email correctly, you are unable to receive Yahoo!
emails on your HTC EVO 3D device. I apologize for any inconvenience this
may have caused you. Let me be of assistance.
I have given the information you provided to our Mobile Product Team.
Investigating and resolving this issue may take some time.
Your ticket number for this issue is 4643595. Please refer to this
number in any future correspondence regarding this issue.
It appears that both the Yahoo! Mail application and the Yahoo! Mobile
Mail page are unaffected by this issue. As a work around I recommend you
You can either access your email directly from here, or download the
application via the link presented on this page while we work to resolve
this issue for you. You can also download the application via the
NOTE: If you elected to receive a Yahoo! Customer Satisfaction Survey
when you submitted your help request, you may receive a survey within 72
hours, even if your issue isn't resolved by that time. We appreciate
your taking a few minutes to complete the survey and give us your
feedback on your support experience.
As we work to resolve this issue, a member of Yahoo! Customer Care may
contact you to collect additional information.
Thank you for your assistance.
Please feel free to contact us back should you still have other issues
or concerns. We will be happy to assist you again.
Thank you again for contacting Yahoo! Mobile.
Yahoo! Mobile Customer Care
Mobile General Tech T1