OK it's a long post but this is what I know and what I did:
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What I did is forward all incoming mail of those accounts to @me.com, that worked but I was receiving email on both accounts (@me and domain), so in webmail (of the POP account) I setup the discard all incoming mail option. That is something that my webmail have as an option, I don't know if this can be made in gmail or other POP accounts. Discarding incoming mail and forward option make me receive only emails on my @me acoount.
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Mine does not have that option. I'm using godaddy.com as my webmail accnt because they host my site. Does anyone else use this and know how to set that up? Which are you using?