ICal alerts keep using an old e-mail address

I recently changed my ISP, which changed my e-mail address. I have been sending reminder e-mails alerts to myself so the event will not be forgotten or overlooked.
I have deleted the old e-mail address from my address book and e-mail accounts and I have made sure that my current e-mail address is in my address book.
iCal will send the alert but it is still is using the old e-mail address, which comes back a undeliverable.
I am at a loss as to where to look or search to rid the system of the old address and also how to get iCal to use the correct address.
I have checked preferences, iCal Help to no avail.
Anyone have any suggestions or a solution.

Apps that are downloaded are always linked to the ID that was used.  If oyu want to use a new ID what you need to do is delete the app in question and download it again using your new ID

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