Link Multiple Emails

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Is there any site out there that will let you link several emails together? Whether it is it's own email provider, or if it will simply link a bunch of yahoo's or something together. I want it to get a bunch of YouTube accounts to have emails all sent to one inbox, but I want it to receive emails from several different email addresses in this inbox. Anybody know what I'm talking about, and a way to do this? Best response goes to whoever solves the problem, and if that doesn't happen, then the first comment.