iPhone can‘t access Yahoo! Mail when non-alphanumeric characters are used in the account password

Symptom

Some customers may see the following error message when setting up or checking Yahoo! Mail on iPhone:

"Cannot Get Mail. The user name or password for "imap.apple.mail.yahoo.com" is incorrect"

In some cases this maybe be caused by the use of non-alphanumeric characters in the password for the Yahoo! account.

Solution

Follow these steps to resolve this issue:

1. Log into Yahoo! Mail on the web by visiting mail.yahoo.com.
2. If you were able to sign into web mail, verify that the same username and password are being used on the iPhone.
3. If iPhone is still unable to access Yahoo! Mail, change your Yahoo! password on the web (when logged into Yahoo! Mail, click Options and then click Account information). Be sure to use only letters and numbers in your new password.
4. After this is complete, setup Yahoo! Mail on iPhone using the new password.