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only really to have an account with a junk mail filter for registering on websites(i know eircom doesn't have this facility) and to set up a new eircom or another for a personal account.
i've this and the only unwanted emails i get to my eircom are attached with virus (.zips,.exe,.gifs.etc)I assume they come from friends address books who have my personal email, all the other crap goes to my hotmail with the filter set on high so i only ever check with when i need something or newsletters etc