Allow use of @livejournal.com email as email for another account

[algeh]

Title
Allow use of @livejournal.com email as email for another account
Short, concise description of the idea
Allow @livejournal.com addresses from other accounts to be the email address specified for an account, if that address is valid.
Full description of the idea
I was creating a community, and wanted to put my personal journal's LiveJournal email address (I have a permanent account, and I consider it to be my stable email address) and it would not let me use my algeh@ address as the email for my new chihuahuachase community. I see no reason why I shouldn't be able to do this, the algeh account is valid and forwards to my current email address, I'm jsut trying to save time by not having to change it when that email address changes.
An ordered list of benefits

Allows a user to edit fewer pages when changing email addresses

Lets users use their paid/perm benefit of an email address in another situation

Users with a setup like mine don't have to try to remember to keep a bunch of pages current, since they'd all have a pointer to just one thing I'd have to update

An ordered list of problems/issues involved

Some verification would have to happen to ensure it was a vaild email address (although the vaildation email should take care of that nicely, like it does for everything else.)

A check should still be in place to see that user does not use that account name as their their email address, or it would set up an icky loop, as well as not work. Maybe it should verify that the address in question indeed does point to an offsite email, as well, to prevent a loop between two @livejournal.com addresses

An organized list, or a few short paragraphs detailing suggestions for implementation

Change the cleaner/parser that checks for this to compare the username in the email address with the username of the account, and only disallow it if they match. Possibly add a check to see where the @livejournal.com address actually points, and disallow if it in turn isn't offsite.