Cannot use my Mail application

I recently updated to Snow Leopard to El Capitan.  I use AOL as my main email account.  I changed the AOL password on my computer, iPhone, iPad, etc, but if I go into Apple Mail, which is installed on my computer, it doesn't accept my password.  This application is now totally useless for me.  Is there a reason or solution?

You can delete the account

Restart the Mac.

and then try to install it?

Tags: iPhone

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