Yes, we can deactivate a yahoo mail account.
there is no master password for yahoo mail account
You can get a Yahoo! Mail at the link below -
you get a account
yahoo mail
fax from yahoo
You have probably set the account to a receiving-only mail in the account settings. Or Yahoo may have blocked you from sending mail due to spamming.
not open my yahoo mail account
You have to first have a yahoo mail account and then you download yahoo messenger you can get it at: http://messenger.yahoo.com/ Then, you sign in your yahoo mail username for your messenger username and the same way for you password.
From yahoo mail click options and select 'Switch to Yahoo Mail! Classic'.
what is computer
Yahoo Mail