If the Mac is connected to internet, but you can no longer receive or send email message, the issue is related with mail service. Immediately contact at Yahoo customer support phone number to speak with supporting engineers to consult about this issue. Often you could miss or have outdated setting in account section such as for mail preferences. There can be number of issues with mail server or network. Make sure that you’ve installed the most advanced Mac software. If still the problem is there and you’re getting Network offline or login failed message, get in touch with engineers at Yahoo help desk number .
Any More Details You Can Visit our site:http://www.yahooonlinesupport.com/yahoo-customer-support.html