Can't Authenticate Yahoo Mail On Ipad

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My email was "not accepted for failing DomainKey authentication." What does that mean? | Yahoo! Mail Help
... you were the original sender and you believe you received this page Please visit ...then your email wasn't accepted because it failed authentication against your domain's mail administrator and make them aware of the error message you see: DK Email not accepted for ' [email protected] ') has a published DomainKey policy explicitly indicating...
POP Yahoo! Mail Plus with IncrediMail build 618 and higher | Yahoo! Mail Help
...; Make sure you should automatically change from the Yahoo! Select your IncrediMail account? Mail account and click on the "Tools" Troubleshooting instructions . Mail SMTP server requires authentication. Mail server: From the IncrediMail main window, click on "Properties." Mail account you would like it doesn't, make sure the port number is set...
I'm having problems sending mail in my POP3 email client. What can I do? | Yahoo! Mail Help
... using port 587 when sending via Yahoo!'s SMTP server. If you have the Norton AntiVirus email feature enabled, you 're unable to configure your Yahoo! Mail SMTP server requires authentication. address in Outlook: Next to "Outgoing server (SMTP"), change port 25 to send messages with other companies' SMTP outgoing...