Would need a lot more information...
Browser, Operating System, Do you use a 'mail client' like Outlook, Thunderbird, etc.
Type of internet connection, all that good stuff.
And a detailed description of all the steps leading up to that 'error message'...
Simple little problems require lots of information to diagnose remotely.
~~~GrayBeard~~~
Email me off group with all the details if you want me to get my 'hound dogs' working on it.