I'll second what Steve posted. I know for a fact that Earthlink requires authentication configured if you are not accessing your email from an Earthlink connection. I assume many other providers are doing the same thing, mostly in an attempt to cut down on Spam.
I recommend checking your email provider's web site to see if they have special instructions for accessing email from off their network or remote email access. Something along those lines.
Your provider may also have a web mail option that you can use when traveling.
Fred
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