Hello ! Every one.

My question are divided into two parts

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I am having a difficulty regarding receiving my mails. I have 3 gmail accounts & 1 yahoo account. In windows, I use Microsoft outlook or microsoft outlook express. But In mac is there any inbuilt software for it ? If not, is that any freely available mail client for mac osx ?

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• One more thing, My system administrators has banned regular gmail & yahoo sites.
• Means I can't use gmail or yahoo site for mailing.
• Ok. I don't want to break my office rules - but what about my mails on gmail & yahoo, they are really very important for me.
• Means that - I just want to access incoming mails nothing more than that.