How do I change the default email? Can I have more than one email sending todos?
I fixed the first pat had an old duplicate account which I deleted. But second question is still open, can I have multiple email addresses post todo's?
yes, you can use the "Send tasks via email" feature with multiple email addresses.
To do so, simply add the addresses (or wildcard domains to include all addresses from a certain domain) at the bottom of the window where you find the unique project's email address (the one accessed by clicking on the envelope icon in the upper-right corner of your task list).