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I have many different web site accounts with your service. Can I log into the same web mail url to check mail for all of my accounts?

No. Each unique web site account will have a unique web mail url that you can log into. For example: To access email for myfirstsite.com, you must log into webmail.myfirstsite.com, and to access email for mysecondsite.net, you must log into webmail.mysecondsite.net.