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Log into .Mac > Mail > Preferences > Aliases

Select up to 5 additional email addresses for your account. They will all be redirected to your one email account, but you can use different email addresses for different purposes.

From the .Mac Help:

Creating an alias
You can create up to five email aliases to help prevent unwanted messages from being sent to your primary .Mac Mail account or for use with online groups and chat websites. For example, you might want to share your main .Mac Mail address with friends and family only and use email aliases for online registrations, purchasing products, joining mailing lists, and so on. This will help you better manage the email you receive and monitor the sources of unwanted messages. You can even send email using an email alias.
 
You get 1 email account per membership. Tied to that will be two addresses, username@mac.com and username@me.com. You can also create aliases which are just different addresses that tie into the same account.

Again: Even though you can have multiple addresses, you only have 1 account, it all feeds into the same inbox.

If you want additional accounts, you can buy then for an additional $10 each (I think).
 
Not without paying $10 extra.

Per the question and my answer, no you don't pay 10 bucks extra, current customers will get 2 email addresses when/if they continue with the me.com, yah they're tied to one global box, but hey, semantics eh?

June 9, 2008
As a current .Mac member, your @mac.com email will continue to work as it always has. But your account will also be given a new email address @me.com.
Even if you do nothing, email sent to either address will still arrive in your inbox and you can send email from either address in MobileMe Mail on the web. However, in order to send email from your me.com address in your email client (e.g. the Mail application on your Mac), you will need to set up your me.com account in Mail preferences.
You may also use either address as your Apple ID for purchases on the Apple Store or iTunes—they are automatically linked. However, they will work separately as an iChat ID.
For more details, including how to set up your new address in Mac OS X Mail and iChat, go to the MobileMe FAQ.
 
Per the question and my answer, no you don't pay 10 bucks extra, current customers will get 2 email addresses when/if they continue with the me.com, yah they're tied to one global box, but hey, semantics eh?

Actually, you brought up a good point, and now I'm wondering. I wonder if the transition to .me means any existing .mac account will be considered an alias on the .me account? If it is, and you've already chosen the maximum of 5 aliases on your .mac account, does that mean you lose one of them, so your primary .mac account can become an alias to your .me account? Or does it mean you will have 2 separate primary accounts, one @mac.com and one @me.com, each with 5 aliases?
 
Actually, you brought up a good point, and now I'm wondering. I wonder if the transition to .me means any existing .mac account will be considered an alias on the .me account? If it is, and you've already chosen the maximum of 5 aliases on your .mac account, does that mean you lose one of them, so your primary .mac account can become an alias to your .me account? Or does it mean you will have 2 separate primary accounts, one @mac.com and one @me.com, each with 5 aliases?

I kinda see it as a 6th alias. Read the FAQ on MobileMe

Will I still be able to use my mac.com email address?
Yes. You may continue to use your current mac.com email address to send and receive email just as you do today. If you have any email aliases at mac.com, they will also continue to work.
 
I kinda see it as a 6th alias. Read the FAQ on MobileMe

I had to do some searching to find that particular section of the FAQ, but after reading it all, I tend to agree with you: the @me.com address sounds like it will be treated as a 6th alias. Thanks!
 
I had to do some searching to find that particular section of the FAQ, but after reading it all, I tend to agree with you: the @me.com address sounds like it will be treated as a 6th alias. Thanks!

Not to continue this already answered thread, but I'd say the mac.com TURNS into the 6th alias. Seeing as how the service is now 'me.com'

If in the future they decide to discontinue and remove any references to the 'old' service, it would be the mac.com that would get removed.

Like ISP's that transition from one to the next (example adelphia.net to comcast.net) you would continue to receive adelphia.net until a time frame then it would stop.

Mac.com would still be a valid email address, mail forwarded to your me.com email account. If me.com was the alias, it would be Mac.com and any me.com email would get forwarded to mac.com.

Regardless, it's neither here nor there. I for one am looking forward to the new service.

ciao.
 
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