iMac Mail app crashes after click Yahoo button
ATT& Yahoo are closing old versions of mail-box. You are required to re-log-in to switch to the newest version. Click Here. After clicking the button, the Mail app crashed and will not open. It opens up but immediately crashes. How do I contact "free" Yahoo tech support to have them undo what they did. It also wiped out a Google email account included my Mail app.
iMac 21.5″, OS X 10.11