I have to use Yahoo mail before but spam filter not so good compare to gmail..either yahoo or gmail can terminate your account without notice if you violent the rule..after all use these service wisely.. I use Gmail about 5 years without any problem.
I prefer yahoo after Gmail.Yahoo is my second option to mail anyone. In yahoo you also do better video chat.
Use Yahoo Mail. Do NOT, I repeat do NOT use windows live mail. They are so easy to break into. I've got into about five of them no problem and it can cause terrible damage particularly if they are linked to dommain registrar accounts, hosting accounts, and other email accounts.
I use Gmail along with POP3 to send & receive mails from my own @ruchie.com accounts. But as regards to getting fired, it will happen with any email service provider. For e.g. if they receive abuse/spam complaints several times, then there is no exception.