Free email marketing

The email contained misspelled words, was regarding selling electronic products and did not have a signer. They also wiped out my entire email list. This could be dangerous for my contacts. what can I do to protect us from future events like this.

I can access my yahoo answers account, messenger, etc. The only thing I can’t access is my email. WHY? I tried uninstalling my web browser, used multiple different web browsers, etc. The funny thing is that I CAN access my yahoo email from my friend’s computer, so I really can’t understand why this is occurring. This is driving me insane!
Like basically I am at the screen where you enter in your username and password. I do it. Then it takes me to the “Why am I being asked for my password?” page. So I do it again (CORRECTLY, I might add) and it processes the information and loads the next screen but just as I think it’s goign to let me access my email it takes me to that same “Why am I being asked for my password?” page. It’s like a continuous loop of that page.

In US, more people use non-free email service or more people use free email service? What if free email service provide go bankrupt? Will provider pre-inform us that they will close the free service so that we can forward mail to another email address in time?
why not answers? oh my god, the first time not to recieve any answer to my posted question.